Implement HR platform backend with FastAPI and SQLite

- Set up project structure with FastAPI framework - Create database models for users, employees, departments, and job titles - Implement JWT authentication and authorization system - Set up SQLite database with SQLAlchemy ORM - Add Alembic migrations for database versioning - Create CRUD API endpoints for employee management - Implement category-based search functionality - Add OpenAPI documentation and health check endpoint - Update README with comprehensive setup and usage instructions
2025-06-03 01:18:41 +00:00 · 2025-06-03 01:18:41 +00:00 · 27c9268a6a
commit 27c9268a6a
parent 63098c86db
43 changed files with 1967 additions and 2 deletions
--- a/README.md
+++ b/README.md
@ -1,3 +1,168 @@
-# FastAPI Application
+# HR Platform Backend

-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A comprehensive HR platform backend built with FastAPI and SQLite, providing employee management, authentication, and category-based search functionality.
+
+## Features
+
+- **Authentication & Authorization**: JWT-based authentication system with user roles
+- **Employee Management**: Complete CRUD operations for employees
+- **Department Management**: Organize employees by departments
+- **Job Title Management**: Manage job positions and titles
+- **Category-Based Search**: Advanced search functionality by skills, categories, departments, and more
+- **OpenAPI Documentation**: Interactive API documentation with Swagger UI and ReDoc
+- **Health Check Endpoint**: Monitor the health of the API and database
+
+## Tech Stack
+
+- **Framework**: FastAPI
+- **Database**: SQLite
+- **ORM**: SQLAlchemy
+- **Migrations**: Alembic
+- **Authentication**: JWT (JSON Web Tokens)
+- **API Documentation**: OpenAPI (Swagger and ReDoc)
+
+## Project Structure
+
+```
+.
+├── alembic.ini              # Alembic configuration
+├── app                      # Main application package
+│   ├── api                  # API endpoints
+│   │   ├── deps.py          # API dependencies
+│   │   ├── routes.py        # API router
+│   │   └── v1               # API version 1 endpoints
+│   ├── core                 # Core application modules
+│   │   ├── config.py        # Application configuration
+│   │   └── security.py      # Security utilities
+│   ├── crud                 # CRUD operations
+│   ├── db                   # Database setup
+│   │   ├── base.py          # Base models import
+│   │   ├── base_class.py    # Base model class
+│   │   ├── init_db.py       # Database initialization
+│   │   └── session.py       # Database session
+│   ├── models               # SQLAlchemy models
+│   └── schemas              # Pydantic schemas
+├── main.py                  # Application entry point
+├── migrations               # Alembic migrations
+│   ├── env.py               # Migration environment
+│   ├── script.py.mako       # Migration script template
+│   └── versions             # Migration versions
+├── openapi.json             # Generated OpenAPI schema
+├── openapi_schema.py        # Script to generate OpenAPI schema
+└── requirements.txt         # Python dependencies
+```
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8 or higher
+- pip (Python package installer)
+
+### Installation
+
+1. Clone the repository:
+   ```bash
+   git clone <repository-url>
+   cd hrplatformbackend
+   ```
+
+2. Install the dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. Set environment variables (optional, defaults are provided):
+   ```bash
+   export SECRET_KEY="your-secret-key"
+   export FIRST_SUPERUSER="admin@example.com"
+   export FIRST_SUPERUSER_PASSWORD="admin123"
+   ```
+
+### Running Migrations
+
+Run Alembic migrations to set up the database schema:
+
+```bash
+alembic upgrade head
+```
+
+### Running the Application
+
+Start the FastAPI server:
+
+```bash
+uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+```
+
+The API will be available at [http://localhost:8000](http://localhost:8000)
+
+## API Documentation
+
+Once the server is running, you can access the interactive API documentation:
+
+- Swagger UI: [http://localhost:8000/docs](http://localhost:8000/docs)
+- ReDoc: [http://localhost:8000/redoc](http://localhost:8000/redoc)
+- OpenAPI JSON: [http://localhost:8000/openapi.json](http://localhost:8000/openapi.json)
+
+## Usage
+
+### Authentication
+
+1. Register a new user:
+   ```bash
+   curl -X POST "http://localhost:8000/api/v1/auth/register" \
+     -H "Content-Type: application/json" \
+     -d '{"email": "user@example.com", "password": "password123", "full_name": "Example User"}'
+   ```
+
+2. Login to get access token:
+   ```bash
+   curl -X POST "http://localhost:8000/api/v1/auth/login" \
+     -H "Content-Type: application/x-www-form-urlencoded" \
+     -d "username=user@example.com&password=password123"
+   ```
+
+3. Use the token for authenticated requests:
+   ```bash
+   curl -X GET "http://localhost:8000/api/v1/users/me" \
+     -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
+   ```
+
+### Employee Management
+
+1. Create a new employee:
+   ```bash
+   curl -X POST "http://localhost:8000/api/v1/employees/" \
+     -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+     -H "Content-Type: application/json" \
+     -d '{
+       "first_name": "John",
+       "last_name": "Doe",
+       "email": "john.doe@example.com",
+       "hire_date": "2023-01-15",
+       "department_id": "department_id_here",
+       "job_title_id": "job_title_id_here"
+     }'
+   ```
+
+2. Search employees by category:
+   ```bash
+   curl -X GET "http://localhost:8000/api/v1/employees/search/?categories=IT&skills=Python&department_id=dept_id" \
+     -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
+   ```
+
+## Environment Variables
+
+| Variable                  | Description                               | Default Value                             |
+|---------------------------|-------------------------------------------|-------------------------------------------|
+| PROJECT_NAME              | Name of the project                       | HR Platform API                           |
+| SECRET_KEY                | Secret key for JWT encoding               | Auto-generated                            |
+| ACCESS_TOKEN_EXPIRE_MINUTES| JWT token expiration time in minutes     | 11520 (8 days)                           |
+| FIRST_SUPERUSER           | Email for the initial admin user          | admin@example.com                         |
+| FIRST_SUPERUSER_PASSWORD  | Password for the initial admin user       | admin123                                  |
+| SQLALCHEMY_DATABASE_URI   | Database connection URI                   | sqlite:////app/storage/db/db.sqlite       |
+
+## License
+
+This project is licensed under the MIT License - see the LICENSE file for details.
--- a/alembic.ini
+++ b/alembic.ini
@ -0,0 +1,85 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; this defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL example
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks=black
+# black.type=console_scripts
+# black.entrypoint=black
+# black.options=-l 79
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
--- a/app/init.py
+++ b/app/init.py
--- a/app/api/init.py
+++ b/app/api/init.py
--- a/app/api/deps.py
+++ b/app/api/deps.py
@ -0,0 +1,52 @@
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.core import security
+from app.core.config import settings
+from app.db.session import get_db
+
+reusable_oauth2 = OAuth2PasswordBearer(
+    tokenUrl=f"{settings.API_V1_STR}/auth/login"
+)
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(reusable_oauth2)
+) -> models.User:
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[security.ALGORITHM]
+        )
+        token_data = schemas.TokenPayload(**payload)
+    except (jwt.JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Could not validate credentials",
+        )
+    user = crud.user.get(db, id=token_data.sub)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+
+def get_current_active_user(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    if not crud.user.is_active(current_user):
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+
+def get_current_active_superuser(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    if not crud.user.is_superuser(current_user):
+        raise HTTPException(
+            status_code=400, detail="The user doesn't have enough privileges"
+        )
+    return current_user
--- a/app/api/routes.py
+++ b/app/api/routes.py
@ -0,0 +1,10 @@
+from fastapi import APIRouter
+
+from app.api.v1 import auth, users, employees, departments, job_titles
+
+api_router = APIRouter()
+api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["users"])
+api_router.include_router(employees.router, prefix="/employees", tags=["employees"])
+api_router.include_router(departments.router, prefix="/departments", tags=["departments"])
+api_router.include_router(job_titles.router, prefix="/job-titles", tags=["job_titles"])
--- a/app/api/v1/init.py
+++ b/app/api/v1/init.py
--- a/app/api/v1/auth.py
+++ b/app/api/v1/auth.py
@ -0,0 +1,63 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+from app.core import security
+from app.core.config import settings
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=schemas.Token)
+def login_access_token(
+    db: Session = Depends(deps.get_db), form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests
+    """
+    user = crud.user.authenticate(
+        db, email=form_data.username, password=form_data.password
+    )
+    if not user:
+        raise HTTPException(status_code=400, detail="Incorrect email or password")
+    elif not crud.user.is_active(user):
+        raise HTTPException(status_code=400, detail="Inactive user")
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": security.create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/register", response_model=schemas.User)
+def register_user(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: schemas.UserCreate,
+) -> Any:
+    """
+    Register a new user
+    """
+    user = crud.user.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=400,
+            detail="The user with this email already exists in the system",
+        )
+    user = crud.user.create(db, obj_in=user_in)
+    return user
+
+
+@router.post("/test-token", response_model=schemas.User)
+def test_token(current_user: models.User = Depends(deps.get_current_user)) -> Any:
+    """
+    Test access token
+    """
+    return current_user
--- a/app/api/v1/departments.py
+++ b/app/api/v1/departments.py
@ -0,0 +1,113 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[schemas.Department])
+def read_departments(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Retrieve departments.
+    """
+    departments = crud.department.get_multi(db, skip=skip, limit=limit)
+    return departments
+
+
+@router.post("/", response_model=schemas.Department)
+def create_department(
+    *,
+    db: Session = Depends(deps.get_db),
+    department_in: schemas.DepartmentCreate,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Create new department.
+    """
+    department = crud.department.get_by_name(db, name=department_in.name)
+    if department:
+        raise HTTPException(
+            status_code=400,
+            detail="The department with this name already exists in the system",
+        )
+    department = crud.department.create(db, obj_in=department_in)
+    return department
+
+
+@router.get("/{id}", response_model=schemas.Department)
+def read_department(
+    *,
+    db: Session = Depends(deps.get_db),
+    id: str,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get department by ID.
+    """
+    department = crud.department.get(db, id=id)
+    if not department:
+        raise HTTPException(status_code=404, detail="Department not found")
+    return department
+
+
+@router.put("/{id}", response_model=schemas.Department)
+def update_department(
+    *,
+    db: Session = Depends(deps.get_db),
+    id: str,
+    department_in: schemas.DepartmentUpdate,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Update a department.
+    """
+    department = crud.department.get(db, id=id)
+    if not department:
+        raise HTTPException(status_code=404, detail="Department not found")
+    
+    # Check if name is changed and if the new name already exists
+    if department_in.name and department_in.name != department.name:
+        existing_department = crud.department.get_by_name(db, name=department_in.name)
+        if existing_department:
+            raise HTTPException(
+                status_code=400,
+                detail="The department with this name already exists in the system",
+            )
+    
+    department = crud.department.update(db, db_obj=department, obj_in=department_in)
+    return department
+
+
+@router.delete("/{id}", status_code=204, response_model=None)
+def delete_department(
+    *,
+    db: Session = Depends(deps.get_db),
+    id: str,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Delete a department.
+    """
+    department = crud.department.get(db, id=id)
+    if not department:
+        raise HTTPException(status_code=404, detail="Department not found")
+    
+    # Check if there are employees in this department
+    employees = db.query(models.Employee).filter(models.Employee.department_id == id).first()
+    if employees:
+        raise HTTPException(
+            status_code=400,
+            detail="Cannot delete department with employees. Reassign employees first.",
+        )
+    
+    crud.department.remove(db, id=id)
+    return None
--- a/app/api/v1/employees.py
+++ b/app/api/v1/employees.py
@ -0,0 +1,275 @@
+from typing import Any, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[schemas.Employee])
+def read_employees(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Retrieve employees.
+    """
+    employees = crud.employee.get_all(db, skip=skip, limit=limit)
+    return employees
+
+
+@router.post("/", response_model=schemas.Employee)
+def create_employee(
+    *,
+    db: Session = Depends(deps.get_db),
+    employee_in: schemas.EmployeeCreate,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Create new employee.
+    """
+    # Check if email already exists
+    employee = crud.employee.get_by_email(db, email=employee_in.email)
+    if employee:
+        raise HTTPException(
+            status_code=400,
+            detail="The employee with this email already exists in the system",
+        )
+    
+    # Check if department exists
+    department = crud.department.get(db, id=employee_in.department_id)
+    if not department:
+        raise HTTPException(
+            status_code=404,
+            detail=f"Department with id {employee_in.department_id} not found",
+        )
+    
+    # Check if job title exists
+    job_title = crud.job_title.get(db, id=employee_in.job_title_id)
+    if not job_title:
+        raise HTTPException(
+            status_code=404,
+            detail=f"Job title with id {employee_in.job_title_id} not found",
+        )
+    
+    # Check if manager exists (if provided)
+    if employee_in.manager_id:
+        manager = crud.employee.get(db, id=employee_in.manager_id)
+        if not manager:
+            raise HTTPException(
+                status_code=404,
+                detail=f"Manager with id {employee_in.manager_id} not found",
+            )
+    
+    employee = crud.employee.create(db, obj_in=employee_in)
+    return employee
+
+
+@router.get("/{employee_id}", response_model=schemas.EmployeeWithDetails)
+def read_employee(
+    *,
+    db: Session = Depends(deps.get_db),
+    employee_id: str,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get employee by ID.
+    """
+    employee = crud.employee.get(db, id=employee_id)
+    if not employee:
+        raise HTTPException(status_code=404, detail="Employee not found")
+    return employee
+
+
+@router.put("/{employee_id}", response_model=schemas.Employee)
+def update_employee(
+    *,
+    db: Session = Depends(deps.get_db),
+    employee_id: str,
+    employee_in: schemas.EmployeeUpdate,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Update an employee.
+    """
+    employee = crud.employee.get(db, id=employee_id)
+    if not employee:
+        raise HTTPException(status_code=404, detail="Employee not found")
+    
+    # If email is being updated, check if it already exists
+    if employee_in.email and employee_in.email != employee.email:
+        existing_employee = crud.employee.get_by_email(db, email=employee_in.email)
+        if existing_employee:
+            raise HTTPException(
+                status_code=400,
+                detail="The employee with this email already exists in the system",
+            )
+    
+    # Check if department exists (if provided)
+    if employee_in.department_id:
+        department = crud.department.get(db, id=employee_in.department_id)
+        if not department:
+            raise HTTPException(
+                status_code=404,
+                detail=f"Department with id {employee_in.department_id} not found",
+            )
+    
+    # Check if job title exists (if provided)
+    if employee_in.job_title_id:
+        job_title = crud.job_title.get(db, id=employee_in.job_title_id)
+        if not job_title:
+            raise HTTPException(
+                status_code=404,
+                detail=f"Job title with id {employee_in.job_title_id} not found",
+            )
+    
+    # Check if manager exists (if provided)
+    if employee_in.manager_id:
+        # Prevent self-assignment as manager
+        if employee_in.manager_id == employee_id:
+            raise HTTPException(
+                status_code=400,
+                detail="An employee cannot be their own manager",
+            )
+        
+        manager = crud.employee.get(db, id=employee_in.manager_id)
+        if not manager:
+            raise HTTPException(
+                status_code=404,
+                detail=f"Manager with id {employee_in.manager_id} not found",
+            )
+    
+    employee = crud.employee.update(db, db_obj=employee, obj_in=employee_in)
+    return employee
+
+
+@router.delete("/{employee_id}", status_code=204, response_model=None)
+def delete_employee(
+    *,
+    db: Session = Depends(deps.get_db),
+    employee_id: str,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Delete an employee.
+    """
+    employee = crud.employee.get(db, id=employee_id)
+    if not employee:
+        raise HTTPException(status_code=404, detail="Employee not found")
+    
+    # Check if this employee is a manager for other employees
+    subordinates = db.query(models.Employee).filter(models.Employee.manager_id == employee_id).first()
+    if subordinates:
+        raise HTTPException(
+            status_code=400,
+            detail="Cannot delete employee who is a manager. Reassign subordinates first.",
+        )
+    
+    crud.employee.remove(db, id=employee_id)
+    return None
+
+
+@router.get("/department/{department_id}", response_model=List[schemas.Employee])
+def read_employees_by_department(
+    *,
+    db: Session = Depends(deps.get_db),
+    department_id: str,
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Retrieve employees by department.
+    """
+    # Check if department exists
+    department = crud.department.get(db, id=department_id)
+    if not department:
+        raise HTTPException(status_code=404, detail="Department not found")
+    
+    employees = crud.employee.get_by_department(
+        db, department_id=department_id, skip=skip, limit=limit
+    )
+    return employees
+
+
+@router.get("/job-title/{job_title_id}", response_model=List[schemas.Employee])
+def read_employees_by_job_title(
+    *,
+    db: Session = Depends(deps.get_db),
+    job_title_id: str,
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Retrieve employees by job title.
+    """
+    # Check if job title exists
+    job_title = crud.job_title.get(db, id=job_title_id)
+    if not job_title:
+        raise HTTPException(status_code=404, detail="Job title not found")
+    
+    employees = crud.employee.get_by_job_title(
+        db, job_title_id=job_title_id, skip=skip, limit=limit
+    )
+    return employees
+
+
+@router.get("/manager/{manager_id}", response_model=List[schemas.Employee])
+def read_employees_by_manager(
+    *,
+    db: Session = Depends(deps.get_db),
+    manager_id: str,
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Retrieve employees by manager.
+    """
+    # Check if manager exists
+    manager = crud.employee.get(db, id=manager_id)
+    if not manager:
+        raise HTTPException(status_code=404, detail="Manager not found")
+    
+    employees = crud.employee.get_by_manager(
+        db, manager_id=manager_id, skip=skip, limit=limit
+    )
+    return employees
+
+
+@router.get("/search/", response_model=List[schemas.Employee])
+def search_employees(
+    *,
+    db: Session = Depends(deps.get_db),
+    department_id: Optional[str] = None,
+    job_title_id: Optional[str] = None,
+    name: Optional[str] = None,
+    skills: Optional[List[str]] = Query(None),
+    categories: Optional[List[str]] = Query(None),
+    is_active: Optional[bool] = True,
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Search employees by various criteria including categories and skills.
+    """
+    search_params = schemas.EmployeeSearchParams(
+        department_id=department_id,
+        job_title_id=job_title_id,
+        name=name,
+        skills=skills,
+        categories=categories,
+        is_active=is_active,
+    )
+    
+    employees = crud.employee.search(
+        db, params=search_params, skip=skip, limit=limit
+    )
+    return employees
--- a/app/api/v1/job_titles.py
+++ b/app/api/v1/job_titles.py
@ -0,0 +1,113 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[schemas.JobTitle])
+def read_job_titles(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Retrieve job titles.
+    """
+    job_titles = crud.job_title.get_multi(db, skip=skip, limit=limit)
+    return job_titles
+
+
+@router.post("/", response_model=schemas.JobTitle)
+def create_job_title(
+    *,
+    db: Session = Depends(deps.get_db),
+    job_title_in: schemas.JobTitleCreate,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Create new job title.
+    """
+    job_title = crud.job_title.get_by_title(db, title=job_title_in.title)
+    if job_title:
+        raise HTTPException(
+            status_code=400,
+            detail="The job title with this name already exists in the system",
+        )
+    job_title = crud.job_title.create(db, obj_in=job_title_in)
+    return job_title
+
+
+@router.get("/{id}", response_model=schemas.JobTitle)
+def read_job_title(
+    *,
+    db: Session = Depends(deps.get_db),
+    id: str,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get job title by ID.
+    """
+    job_title = crud.job_title.get(db, id=id)
+    if not job_title:
+        raise HTTPException(status_code=404, detail="Job title not found")
+    return job_title
+
+
+@router.put("/{id}", response_model=schemas.JobTitle)
+def update_job_title(
+    *,
+    db: Session = Depends(deps.get_db),
+    id: str,
+    job_title_in: schemas.JobTitleUpdate,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Update a job title.
+    """
+    job_title = crud.job_title.get(db, id=id)
+    if not job_title:
+        raise HTTPException(status_code=404, detail="Job title not found")
+    
+    # Check if title is changed and if the new title already exists
+    if job_title_in.title and job_title_in.title != job_title.title:
+        existing_job_title = crud.job_title.get_by_title(db, title=job_title_in.title)
+        if existing_job_title:
+            raise HTTPException(
+                status_code=400,
+                detail="The job title with this name already exists in the system",
+            )
+    
+    job_title = crud.job_title.update(db, db_obj=job_title, obj_in=job_title_in)
+    return job_title
+
+
+@router.delete("/{id}", status_code=204, response_model=None)
+def delete_job_title(
+    *,
+    db: Session = Depends(deps.get_db),
+    id: str,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Delete a job title.
+    """
+    job_title = crud.job_title.get(db, id=id)
+    if not job_title:
+        raise HTTPException(status_code=404, detail="Job title not found")
+    
+    # Check if there are employees with this job title
+    employees = db.query(models.Employee).filter(models.Employee.job_title_id == id).first()
+    if employees:
+        raise HTTPException(
+            status_code=400,
+            detail="Cannot delete job title assigned to employees. Reassign employees first.",
+        )
+    
+    crud.job_title.remove(db, id=id)
+    return None
--- a/app/api/v1/users.py
+++ b/app/api/v1/users.py
@ -0,0 +1,99 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Body, Depends, HTTPException
+from fastapi.encoders import jsonable_encoder
+from pydantic import EmailStr
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[schemas.User])
+def read_users(
+    db: Session = Depends(deps.get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Retrieve users.
+    """
+    users = crud.user.get_multi(db, skip=skip, limit=limit)
+    return users
+
+
+@router.get("/me", response_model=schemas.User)
+def read_user_me(
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+
+@router.put("/me", response_model=schemas.User)
+def update_user_me(
+    *,
+    db: Session = Depends(deps.get_db),
+    password: str = Body(None),
+    full_name: str = Body(None),
+    email: EmailStr = Body(None),
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Update own user.
+    """
+    current_user_data = jsonable_encoder(current_user)
+    user_in = schemas.UserUpdate(**current_user_data)
+    if password is not None:
+        user_in.password = password
+    if full_name is not None:
+        user_in.full_name = full_name
+    if email is not None:
+        user_in.email = email
+    user = crud.user.update(db, db_obj=current_user, obj_in=user_in)
+    return user
+
+
+@router.get("/{user_id}", response_model=schemas.User)
+def read_user_by_id(
+    user_id: str,
+    current_user: models.User = Depends(deps.get_current_active_user),
+    db: Session = Depends(deps.get_db),
+) -> Any:
+    """
+    Get a specific user by id.
+    """
+    user = crud.user.get(db, id=user_id)
+    if user == current_user:
+        return user
+    if not crud.user.is_superuser(current_user):
+        raise HTTPException(
+            status_code=400, detail="The user doesn't have enough privileges"
+        )
+    return user
+
+
+@router.put("/{user_id}", response_model=schemas.User)
+def update_user(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_id: str,
+    user_in: schemas.UserUpdate,
+    current_user: models.User = Depends(deps.get_current_active_superuser),
+) -> Any:
+    """
+    Update a user.
+    """
+    user = crud.user.get(db, id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=404,
+            detail="The user with this username does not exist in the system",
+        )
+    user = crud.user.update(db, db_obj=user, obj_in=user_in)
+    return user
--- a/app/core/init.py
+++ b/app/core/init.py
--- a/app/core/config.py
+++ b/app/core/config.py
@ -0,0 +1,40 @@
+from typing import List, Optional
+from pydantic_settings import BaseSettings
+from pydantic import validator, EmailStr
+import secrets
+
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "HR Platform API"
+    API_V1_STR: str = "/api/v1"
+    
+    # SECURITY
+    SECRET_KEY: str = secrets.token_urlsafe(32)
+    # 60 minutes * 24 hours * 8 days = 8 days
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
+    
+    # CORS
+    BACKEND_CORS_ORIGINS: List[str] = ["*"]
+
+    # First superuser
+    FIRST_SUPERUSER: EmailStr = "admin@example.com"
+    FIRST_SUPERUSER_PASSWORD: str = "admin123"
+
+    # SQLITE DB
+    SQLALCHEMY_DATABASE_URI: Optional[str] = None
+
+    @validator("SQLALCHEMY_DATABASE_URI", pre=True)
+    def assemble_db_connection(cls, v: Optional[str], values: dict) -> str:
+        if v:
+            return v
+        from pathlib import Path
+        DB_DIR = Path("/app") / "storage" / "db"
+        DB_DIR.mkdir(parents=True, exist_ok=True)
+        return f"sqlite:///{DB_DIR}/db.sqlite"
+
+    class Config:
+        case_sensitive = True
+        env_file = ".env"
+
+
+settings = Settings()
--- a/app/core/security.py
+++ b/app/core/security.py
@ -0,0 +1,30 @@
+from datetime import datetime, timedelta
+from typing import Any, Union
+from jose import jwt
+from passlib.context import CryptContext
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+ALGORITHM = "HS256"
+
+def create_access_token(
+    subject: Union[str, Any], expires_delta: timedelta = None
+) -> str:
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
--- a/app/crud/init.py
+++ b/app/crud/init.py
@ -0,0 +1,6 @@
+from app.crud.user import user
+from app.crud.department import department
+from app.crud.job_title import job_title
+from app.crud.employee import employee
+
+__all__ = ["user", "department", "job_title", "employee"]
--- a/app/crud/base.py
+++ b/app/crud/base.py
@ -0,0 +1,60 @@
+from typing import Any, Dict, Generic, List, Optional, Type, TypeVar, Union
+from fastapi.encoders import jsonable_encoder
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.db.base_class import Base
+
+ModelType = TypeVar("ModelType", bound=Base)
+CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
+UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
+
+
+class CRUDBase(Generic[ModelType, CreateSchemaType, UpdateSchemaType]):
+    def __init__(self, model: Type[ModelType]):
+        """
+        CRUD object with default methods to Create, Read, Update, Delete (CRUD).
+        """
+        self.model = model
+
+    def get(self, db: Session, id: Any) -> Optional[ModelType]:
+        return db.query(self.model).filter(self.model.id == id).first()
+
+    def get_multi(
+        self, db: Session, *, skip: int = 0, limit: int = 100
+    ) -> List[ModelType]:
+        return db.query(self.model).offset(skip).limit(limit).all()
+
+    def create(self, db: Session, *, obj_in: CreateSchemaType) -> ModelType:
+        obj_in_data = jsonable_encoder(obj_in)
+        db_obj = self.model(**obj_in_data)
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self,
+        db: Session,
+        *,
+        db_obj: ModelType,
+        obj_in: Union[UpdateSchemaType, Dict[str, Any]]
+    ) -> ModelType:
+        obj_data = jsonable_encoder(db_obj)
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.model_dump(exclude_unset=True)
+        for field in obj_data:
+            if field in update_data:
+                setattr(db_obj, field, update_data[field])
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def remove(self, db: Session, *, id: Any) -> ModelType:
+        obj = db.query(self.model).get(id)
+        db.delete(obj)
+        db.commit()
+        return obj
--- a/app/crud/department.py
+++ b/app/crud/department.py
@ -0,0 +1,18 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.department import Department
+from app.schemas.department import DepartmentCreate, DepartmentUpdate
+
+
+class CRUDDepartment(CRUDBase[Department, DepartmentCreate, DepartmentUpdate]):
+    def get_by_name(self, db: Session, *, name: str) -> Optional[Department]:
+        return db.query(Department).filter(Department.name == name).first()
+    
+    def get_all(self, db: Session) -> List[Department]:
+        return db.query(Department).all()
+
+
+department = CRUDDepartment(Department)
--- a/app/crud/employee.py
+++ b/app/crud/employee.py
@ -0,0 +1,64 @@
+from typing import List, Optional
+from sqlalchemy.orm import Session
+from sqlalchemy import or_
+
+from app.crud.base import CRUDBase
+from app.models.employee import Employee
+from app.schemas.employee import EmployeeCreate, EmployeeUpdate, EmployeeSearchParams
+
+
+class CRUDEmployee(CRUDBase[Employee, EmployeeCreate, EmployeeUpdate]):
+    def get_by_email(self, db: Session, *, email: str) -> Optional[Employee]:
+        return db.query(Employee).filter(Employee.email == email).first()
+    
+    def get_all(self, db: Session, *, skip: int = 0, limit: int = 100) -> List[Employee]:
+        return db.query(Employee).offset(skip).limit(limit).all()
+    
+    def get_by_department(self, db: Session, *, department_id: str, skip: int = 0, limit: int = 100) -> List[Employee]:
+        return db.query(Employee).filter(Employee.department_id == department_id).offset(skip).limit(limit).all()
+    
+    def get_by_job_title(self, db: Session, *, job_title_id: str, skip: int = 0, limit: int = 100) -> List[Employee]:
+        return db.query(Employee).filter(Employee.job_title_id == job_title_id).offset(skip).limit(limit).all()
+    
+    def get_by_manager(self, db: Session, *, manager_id: str, skip: int = 0, limit: int = 100) -> List[Employee]:
+        return db.query(Employee).filter(Employee.manager_id == manager_id).offset(skip).limit(limit).all()
+    
+    def search(self, db: Session, *, params: EmployeeSearchParams, skip: int = 0, limit: int = 100) -> List[Employee]:
+        query = db.query(Employee)
+        
+        # Apply filters based on the search parameters
+        if params.department_id:
+            query = query.filter(Employee.department_id == params.department_id)
+        
+        if params.job_title_id:
+            query = query.filter(Employee.job_title_id == params.job_title_id)
+        
+        if params.is_active is not None:
+            query = query.filter(Employee.is_active == params.is_active)
+        
+        if params.name:
+            query = query.filter(
+                or_(
+                    Employee.first_name.ilike(f"%{params.name}%"),
+                    Employee.last_name.ilike(f"%{params.name}%")
+                )
+            )
+        
+        if params.skills:
+            skill_filters = []
+            for skill in params.skills:
+                skill_filters.append(Employee.skills.ilike(f"%{skill}%"))
+            if skill_filters:
+                query = query.filter(or_(*skill_filters))
+        
+        if params.categories:
+            category_filters = []
+            for category in params.categories:
+                category_filters.append(Employee.categories.ilike(f"%{category}%"))
+            if category_filters:
+                query = query.filter(or_(*category_filters))
+        
+        return query.offset(skip).limit(limit).all()
+
+
+employee = CRUDEmployee(Employee)
--- a/app/crud/job_title.py
+++ b/app/crud/job_title.py
@ -0,0 +1,18 @@
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.job_title import JobTitle
+from app.schemas.job_title import JobTitleCreate, JobTitleUpdate
+
+
+class CRUDJobTitle(CRUDBase[JobTitle, JobTitleCreate, JobTitleUpdate]):
+    def get_by_title(self, db: Session, *, title: str) -> Optional[JobTitle]:
+        return db.query(JobTitle).filter(JobTitle.title == title).first()
+    
+    def get_all(self, db: Session) -> List[JobTitle]:
+        return db.query(JobTitle).all()
+
+
+job_title = CRUDJobTitle(JobTitle)
--- a/app/crud/user.py
+++ b/app/crud/user.py
@ -0,0 +1,56 @@
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.crud.base import CRUDBase
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+class CRUDUser(CRUDBase[User, UserCreate, UserUpdate]):
+    def get_by_email(self, db: Session, *, email: str) -> Optional[User]:
+        return db.query(User).filter(User.email == email).first()
+
+    def create(self, db: Session, *, obj_in: UserCreate) -> User:
+        db_obj = User(
+            email=obj_in.email,
+            hashed_password=get_password_hash(obj_in.password),
+            full_name=obj_in.full_name,
+            is_superuser=obj_in.is_superuser,
+            is_active=obj_in.is_active,
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self, db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+    ) -> User:
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.model_dump(exclude_unset=True)
+        if update_data.get("password"):
+            hashed_password = get_password_hash(update_data["password"])
+            del update_data["password"]
+            update_data["hashed_password"] = hashed_password
+        return super().update(db, db_obj=db_obj, obj_in=update_data)
+
+    def authenticate(self, db: Session, *, email: str, password: str) -> Optional[User]:
+        user = self.get_by_email(db, email=email)
+        if not user:
+            return None
+        if not verify_password(password, user.hashed_password):
+            return None
+        return user
+
+    def is_active(self, user: User) -> bool:
+        return user.is_active
+
+    def is_superuser(self, user: User) -> bool:
+        return user.is_superuser
+
+
+user = CRUDUser(User)
--- a/app/db/init.py
+++ b/app/db/init.py
--- a/app/db/base.py
+++ b/app/db/base.py
@ -0,0 +1,7 @@
+# Import all the models, so that Base has them before being
+# imported by Alembic
+from app.db.base_class import Base  # noqa
+from app.models.user import User  # noqa
+from app.models.employee import Employee  # noqa
+from app.models.department import Department  # noqa
+from app.models.job_title import JobTitle  # noqa
--- a/app/db/base_class.py
+++ b/app/db/base_class.py
@ -0,0 +1,13 @@
+from typing import Any
+from sqlalchemy.ext.declarative import as_declarative, declared_attr
+
+
+@as_declarative()
+class Base:
+    id: Any
+    __name__: str
+    
+    # Generate __tablename__ automatically
+    @declared_attr
+    def __tablename__(cls) -> str:
+        return cls.__name__.lower()
--- a/app/db/init_db.py
+++ b/app/db/init_db.py
@ -0,0 +1,51 @@
+from sqlalchemy.orm import Session
+
+from app import crud, schemas
+from app.core.config import settings
+from app.db import base  # noqa: F401
+
+
+# make sure all SQL Alchemy models are imported (app.db.base) before initializing DB
+# otherwise, SQL Alchemy might fail to initialize relationships properly
+# for more details: https://github.com/tiangolo/full-stack-fastapi-postgresql/issues/28
+
+
+def init_db(db: Session) -> None:
+    # Create first admin user if not exists
+    user = crud.user.get_by_email(db, email=settings.FIRST_SUPERUSER)
+    if not user:
+        user_in = schemas.UserCreate(
+            email=settings.FIRST_SUPERUSER,
+            password=settings.FIRST_SUPERUSER_PASSWORD,
+            is_superuser=True,
+            full_name="Initial Admin User",
+        )
+        user = crud.user.create(db, obj_in=user_in)
+    
+    # Add some initial departments if none exist
+    if db.query(base.Department).count() == 0:
+        departments = [
+            {"name": "HR", "description": "Human Resources Department"},
+            {"name": "IT", "description": "Information Technology Department"},
+            {"name": "Finance", "description": "Finance and Accounting Department"},
+            {"name": "Marketing", "description": "Marketing and Sales Department"},
+            {"name": "Operations", "description": "Operations and Production Department"},
+        ]
+        
+        for dept in departments:
+            dept_in = schemas.DepartmentCreate(**dept)
+            crud.department.create(db, obj_in=dept_in)
+    
+    # Add some initial job titles if none exist
+    if db.query(base.JobTitle).count() == 0:
+        job_titles = [
+            {"title": "HR Manager", "description": "Manages HR operations"},
+            {"title": "Software Engineer", "description": "Develops software applications"},
+            {"title": "Accountant", "description": "Handles financial records and accounting"},
+            {"title": "Marketing Specialist", "description": "Manages marketing campaigns"},
+            {"title": "Operations Manager", "description": "Manages day-to-day operations"},
+        ]
+        
+        for title in job_titles:
+            title_in = schemas.JobTitleCreate(**title)
+            crud.job_title.create(db, obj_in=title_in)
--- a/app/db/session.py
+++ b/app/db/session.py
@ -0,0 +1,23 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
--- a/app/models/init.py
+++ b/app/models/init.py
--- a/app/models/department.py
+++ b/app/models/department.py
@ -0,0 +1,13 @@
+from sqlalchemy import Column, String, DateTime, Text
+from sqlalchemy.sql import func
+from uuid import uuid4
+
+from app.db.base_class import Base
+
+
+class Department(Base):
+    id = Column(String, primary_key=True, index=True, default=lambda: str(uuid4()))
+    name = Column(String, index=True, nullable=False, unique=True)
+    description = Column(Text, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
--- a/app/models/employee.py
+++ b/app/models/employee.py
@ -0,0 +1,38 @@
+from sqlalchemy import Column, String, DateTime, Text, ForeignKey, Date, Boolean
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from uuid import uuid4
+
+from app.db.base_class import Base
+
+
+class Employee(Base):
+    id = Column(String, primary_key=True, index=True, default=lambda: str(uuid4()))
+    first_name = Column(String, index=True, nullable=False)
+    last_name = Column(String, index=True, nullable=False)
+    email = Column(String, unique=True, index=True, nullable=False)
+    phone = Column(String, nullable=True)
+    hire_date = Column(Date, nullable=False)
+    birth_date = Column(Date, nullable=True)
+    address = Column(Text, nullable=True)
+    
+    # Foreign keys
+    department_id = Column(String, ForeignKey("department.id"), nullable=False)
+    job_title_id = Column(String, ForeignKey("jobtitle.id"), nullable=False)
+    manager_id = Column(String, ForeignKey("employee.id"), nullable=True)
+    
+    # Relationships
+    department = relationship("Department", foreign_keys=[department_id])
+    job_title = relationship("JobTitle", foreign_keys=[job_title_id])
+    manager = relationship("Employee", remote_side=[id], backref="subordinates")
+    
+    # Skills and categories for searching
+    skills = Column(Text, nullable=True)  # Comma-separated list of skills
+    categories = Column(Text, nullable=True)  # Comma-separated list of categories
+    
+    # Status
+    is_active = Column(Boolean(), default=True)
+    
+    # Audit fields
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
--- a/app/models/job_title.py
+++ b/app/models/job_title.py
@ -0,0 +1,13 @@
+from sqlalchemy import Column, String, DateTime, Text
+from sqlalchemy.sql import func
+from uuid import uuid4
+
+from app.db.base_class import Base
+
+
+class JobTitle(Base):
+    id = Column(String, primary_key=True, index=True, default=lambda: str(uuid4()))
+    title = Column(String, index=True, nullable=False, unique=True)
+    description = Column(Text, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
--- a/app/models/user.py
+++ b/app/models/user.py
@ -0,0 +1,16 @@
+from sqlalchemy import Boolean, Column, String, DateTime
+from sqlalchemy.sql import func
+from uuid import uuid4
+
+from app.db.base_class import Base
+
+
+class User(Base):
+    id = Column(String, primary_key=True, index=True, default=lambda: str(uuid4()))
+    email = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String, index=True)
+    is_active = Column(Boolean(), default=True)
+    is_superuser = Column(Boolean(), default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
--- a/app/schemas/init.py
+++ b/app/schemas/init.py
--- a/app/schemas/department.py
+++ b/app/schemas/department.py
@ -0,0 +1,38 @@
+from typing import Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+
+# Shared properties
+class DepartmentBase(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class DepartmentCreate(DepartmentBase):
+    name: str
+
+
+# Properties to receive via API on update
+class DepartmentUpdate(DepartmentBase):
+    pass
+
+
+class DepartmentInDBBase(DepartmentBase):
+    id: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class Department(DepartmentInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class DepartmentInDB(DepartmentInDBBase):
+    pass
--- a/app/schemas/employee.py
+++ b/app/schemas/employee.py
@ -0,0 +1,74 @@
+from typing import Optional, List
+from pydantic import BaseModel, EmailStr
+from datetime import datetime, date
+
+from app.schemas.department import Department
+from app.schemas.job_title import JobTitle
+
+
+# Shared properties
+class EmployeeBase(BaseModel):
+    first_name: Optional[str] = None
+    last_name: Optional[str] = None
+    email: Optional[EmailStr] = None
+    phone: Optional[str] = None
+    hire_date: Optional[date] = None
+    birth_date: Optional[date] = None
+    address: Optional[str] = None
+    department_id: Optional[str] = None
+    job_title_id: Optional[str] = None
+    manager_id: Optional[str] = None
+    skills: Optional[str] = None
+    categories: Optional[str] = None
+    is_active: Optional[bool] = True
+
+
+# Properties to receive via API on creation
+class EmployeeCreate(EmployeeBase):
+    first_name: str
+    last_name: str
+    email: EmailStr
+    hire_date: date
+    department_id: str
+    job_title_id: str
+
+
+# Properties to receive via API on update
+class EmployeeUpdate(EmployeeBase):
+    pass
+
+
+class EmployeeInDBBase(EmployeeBase):
+    id: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class Employee(EmployeeInDBBase):
+    pass
+
+
+# Additional properties to return via API with expanded relationships
+class EmployeeWithDetails(EmployeeInDBBase):
+    department: Optional[Department] = None
+    job_title: Optional[JobTitle] = None
+    manager: Optional[Employee] = None
+
+
+# Additional properties stored in DB
+class EmployeeInDB(EmployeeInDBBase):
+    pass
+
+
+# For searching employees
+class EmployeeSearchParams(BaseModel):
+    department_id: Optional[str] = None
+    job_title_id: Optional[str] = None
+    skills: Optional[List[str]] = None
+    categories: Optional[List[str]] = None
+    name: Optional[str] = None  # For searching by first_name or last_name
+    is_active: Optional[bool] = None
--- a/app/schemas/job_title.py
+++ b/app/schemas/job_title.py
@ -0,0 +1,38 @@
+from typing import Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+
+# Shared properties
+class JobTitleBase(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class JobTitleCreate(JobTitleBase):
+    title: str
+
+
+# Properties to receive via API on update
+class JobTitleUpdate(JobTitleBase):
+    pass
+
+
+class JobTitleInDBBase(JobTitleBase):
+    id: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class JobTitle(JobTitleInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class JobTitleInDB(JobTitleInDBBase):
+    pass
--- a/app/schemas/token.py
+++ b/app/schemas/token.py
@ -0,0 +1,11 @@
+from typing import Optional
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    sub: Optional[str] = None
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@ -0,0 +1,41 @@
+from typing import Optional
+from pydantic import BaseModel, EmailStr
+from datetime import datetime
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: Optional[EmailStr] = None
+    is_active: Optional[bool] = True
+    is_superuser: bool = False
+    full_name: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    email: EmailStr
+    password: str
+
+
+# Properties to receive via API on update
+class UserUpdate(UserBase):
+    password: Optional[str] = None
+
+
+class UserInDBBase(UserBase):
+    id: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Additional properties to return via API
+class User(UserInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class UserInDB(UserInDBBase):
+    hashed_password: str
--- a/main.py
+++ b/main.py
@ -0,0 +1,80 @@
+from fastapi import FastAPI, Depends
+from fastapi.middleware.cors import CORSMiddleware
+import uvicorn
+import datetime
+from sqlalchemy.orm import Session
+
+from app.api.routes import api_router
+from app.core.config import settings
+from app.db import session
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description="""
+    HR Platform API provides functionality for managing employees, departments, and job titles.
+    
+    ## Authentication
+    
+    All API endpoints are protected with JWT authentication (except for /auth/login, /auth/register, and /health).
+    To authenticate, you need to:
+    
+    1. Login using the `/api/v1/auth/login` endpoint to get an access token
+    2. Include the token in the Authorization header for all requests: `Authorization: Bearer <token>`
+    
+    ## Features
+    
+    * **User Management**: Create and manage user accounts with different permission levels
+    * **Employee Management**: Add, update, delete, and search employees
+    * **Department Management**: Organize employees by departments
+    * **Job Title Management**: Manage job positions
+    * **Category-Based Search**: Search employees by various criteria including skills and categories
+    """,
+    version="1.0.0",
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+    contact={
+        "name": "HR Platform Support",
+        "email": "support@hrplatform.example.com",
+    },
+    license_info={
+        "name": "MIT License",
+        "url": "https://opensource.org/licenses/MIT",
+    },
+)
+
+# Set up CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+# Health check endpoint
+@app.get("/health", tags=["health"])
+async def health_check(db: Session = Depends(session.get_db)):
+    health_status = {
+        "status": "ok",
+        "api": "up",
+        "timestamp": datetime.datetime.now().isoformat(),
+    }
+    
+    # Check database connection
+    try:
+        # Execute a simple query to check database connection
+        db.execute("SELECT 1")
+        health_status["database"] = "up"
+    except Exception as e:
+        health_status["database"] = "down"
+        health_status["database_error"] = str(e)
+        health_status["status"] = "degraded"
+    
+    return health_status
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
--- a/migrations/env.py
+++ b/migrations/env.py
@ -0,0 +1,83 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from app.db.base import Base  # noqa
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,  # For SQLite
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection, 
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,  # For SQLite
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/migrations/script.py.mako
+++ b/migrations/script.py.mako
@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
--- a/migrations/versions/001_initial_tables.py
+++ b/migrations/versions/001_initial_tables.py
@ -0,0 +1,111 @@
+"""Initial tables
+
+Revision ID: 001
+Revises: 
+Create Date: 2023-10-30 12:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create user table
+    op.create_table(
+        'user',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('is_superuser', sa.Boolean(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
+    op.create_index(op.f('ix_user_full_name'), 'user', ['full_name'], unique=False)
+    op.create_index(op.f('ix_user_id'), 'user', ['id'], unique=False)
+
+    # Create department table
+    op.create_table(
+        'department',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_department_id'), 'department', ['id'], unique=False)
+    op.create_index(op.f('ix_department_name'), 'department', ['name'], unique=True)
+
+    # Create job_title table
+    op.create_table(
+        'jobtitle',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('title', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_jobtitle_id'), 'jobtitle', ['id'], unique=False)
+    op.create_index(op.f('ix_jobtitle_title'), 'jobtitle', ['title'], unique=True)
+
+    # Create employee table
+    op.create_table(
+        'employee',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('first_name', sa.String(), nullable=False),
+        sa.Column('last_name', sa.String(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('phone', sa.String(), nullable=True),
+        sa.Column('hire_date', sa.Date(), nullable=False),
+        sa.Column('birth_date', sa.Date(), nullable=True),
+        sa.Column('address', sa.Text(), nullable=True),
+        sa.Column('department_id', sa.String(), nullable=False),
+        sa.Column('job_title_id', sa.String(), nullable=False),
+        sa.Column('manager_id', sa.String(), nullable=True),
+        sa.Column('skills', sa.Text(), nullable=True),
+        sa.Column('categories', sa.Text(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['department_id'], ['department.id'], ),
+        sa.ForeignKeyConstraint(['job_title_id'], ['jobtitle.id'], ),
+        sa.ForeignKeyConstraint(['manager_id'], ['employee.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_employee_email'), 'employee', ['email'], unique=True)
+    op.create_index(op.f('ix_employee_first_name'), 'employee', ['first_name'], unique=False)
+    op.create_index(op.f('ix_employee_id'), 'employee', ['id'], unique=False)
+    op.create_index(op.f('ix_employee_last_name'), 'employee', ['last_name'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_employee_last_name'), table_name='employee')
+    op.drop_index(op.f('ix_employee_id'), table_name='employee')
+    op.drop_index(op.f('ix_employee_first_name'), table_name='employee')
+    op.drop_index(op.f('ix_employee_email'), table_name='employee')
+    op.drop_table('employee')
+    
+    op.drop_index(op.f('ix_jobtitle_title'), table_name='jobtitle')
+    op.drop_index(op.f('ix_jobtitle_id'), table_name='jobtitle')
+    op.drop_table('jobtitle')
+    
+    op.drop_index(op.f('ix_department_name'), table_name='department')
+    op.drop_index(op.f('ix_department_id'), table_name='department')
+    op.drop_table('department')
+    
+    op.drop_index(op.f('ix_user_id'), table_name='user')
+    op.drop_index(op.f('ix_user_full_name'), table_name='user')
+    op.drop_index(op.f('ix_user_email'), table_name='user')
+    op.drop_table('user')
--- a/openapi_schema.py
+++ b/openapi_schema.py
@ -0,0 +1,11 @@
+import json
+from main import app
+
+# Generate the OpenAPI schema
+schema = app.openapi()
+
+# Write to file
+with open("openapi.json", "w") as f:
+    json.dump(schema, f, indent=2)
+
+print("OpenAPI schema has been generated at openapi.json")
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,13 @@
+fastapi>=0.95.0
+uvicorn>=0.21.1
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.5
+sqlalchemy>=2.0.0
+alembic>=1.11.0
+tenacity>=8.2.2
+email-validator>=2.0.0
+ruff>=0.0.272
+pytest>=7.3.1