diff --git a/README.md b/README.md
index e8acfba..73fdec1 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,86 @@
-# FastAPI Application
+# User Authentication Service
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI-based authentication service that provides user management, JWT authentication, and secure password handling.
+
+## Features
+
+- User registration (signup) and login
+- JWT token-based authentication
+- Secure password hashing using bcrypt
+- User profile management (view, update, delete)
+- SQLite database with SQLAlchemy ORM
+- Alembic migrations for database version control
+- Health check endpoint
+
+## Project Structure
+
+```
+├── alembic/                 # Database migration files
+├── app/                     # Application code
+│   ├── api/                 # API endpoints
+│   │   └── v1/              # API version 1
+│   │       └── endpoints/   # API route handlers
+│   ├── core/                # Core application code
+│   ├── db/                  # Database configuration and repositories
+│   ├── middlewares/         # Middleware components
+│   ├── models/              # SQLAlchemy ORM models
+│   ├── schemas/             # Pydantic schema models
+│   └── services/            # Business logic services
+├── storage/                 # Storage for SQLite database
+└── main.py                  # FastAPI application entry point
+```
+
+## API Endpoints
+
+- **Authentication**
+  - `POST /api/v1/auth/register` - Register a new user
+  - `POST /api/v1/auth/login` - Login and get access token
+  - `GET /api/v1/auth/me` - Get current user information
+
+- **Users**
+  - `GET /api/v1/users/` - List all users (requires authentication)
+  - `GET /api/v1/users/{user_id}` - Get a specific user (requires authentication)
+  - `PUT /api/v1/users/{user_id}` - Update a user (requires authentication)
+  - `DELETE /api/v1/users/{user_id}` - Delete a user (requires authentication)
+
+- **Health Check**
+  - `GET /health` - Check service health status
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8+
+- pip
+
+### Installation
+
+1. Clone the repository
+2. Install dependencies:
+   ```
+   pip install -r requirements.txt
+   ```
+3. Run database migrations:
+   ```
+   alembic upgrade head
+   ```
+4. Start the server:
+   ```
+   uvicorn main:app --reload
+   ```
+
+### Documentation
+
+- Interactive API documentation is available at `/docs` when the server is running
+- ReDoc documentation is available at `/redoc`
+
+## Security
+
+- Passwords are hashed using bcrypt
+- Authentication is handled via JWT tokens
+- CORS is enabled and configurable
+- Environment variables can be used to configure secrets
+
+## License
+
+MIT
\ No newline at end of file
diff --git a/alembic.ini b/alembic.ini
new file mode 100644
index 0000000..7c2c6d4
--- /dev/null
+++ b/alembic.ini
@@ -0,0 +1,40 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+
+sqlalchemy.url = sqlite:///app/storage/db/db.sqlite
+
+[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
\ No newline at end of file
diff --git a/alembic/env.py b/alembic/env.py
new file mode 100644
index 0000000..8c8185e
--- /dev/null
+++ b/alembic/env.py
@@ -0,0 +1,79 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+from app.models import Base
+from app.db.database import SQLALCHEMY_DATABASE_URL
+
+# 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)
+
+# Set the SQLAlchemy URL
+config.set_main_option("sqlalchemy.url", SQLALCHEMY_DATABASE_URL)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+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"},
+    )
+
+    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:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
\ No newline at end of file
diff --git a/alembic/script.py.mako b/alembic/script.py.mako
new file mode 100644
index 0000000..37d0cac
--- /dev/null
+++ b/alembic/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"}
\ No newline at end of file
diff --git a/alembic/versions/initial_migration.py b/alembic/versions/initial_migration.py
new file mode 100644
index 0000000..0966962
--- /dev/null
+++ b/alembic/versions/initial_migration.py
@@ -0,0 +1,43 @@
+"""Initial migration
+
+Revision ID: 001
+Revises:
+Create Date: 2025-05-11
+
+"""
+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:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        'users',
+        sa.Column('id', sa.Integer(), nullable=False, primary_key=True),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('username', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('is_active', sa.Boolean(), nullable=True, default=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), nullable=True, server_default=sa.text('CURRENT_TIMESTAMP')),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True, onupdate=sa.text('CURRENT_TIMESTAMP')),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_table('users')
+    # ### end Alembic commands ###
\ No newline at end of file
diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/api/__init__.py b/app/api/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/api/v1/__init__.py b/app/api/v1/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/api/v1/endpoints/__init__.py b/app/api/v1/endpoints/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/api/v1/endpoints/auth.py b/app/api/v1/endpoints/auth.py
new file mode 100644
index 0000000..7bff86d
--- /dev/null
+++ b/app/api/v1/endpoints/auth.py
@@ -0,0 +1,37 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.db.database import get_db
+from app.schemas.user import UserCreate, User, Token
+from app.services.auth_service import auth_service
+
+router = APIRouter()
+
+@router.post("/register", response_model=User, status_code=status.HTTP_201_CREATED)
+def register(user_in: UserCreate, db: Session = Depends(get_db)):
+    """
+    Register a new user.
+    """
+    return auth_service.register_user(db, user_in)
+
+@router.post("/login", response_model=Token)
+def login(form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)):
+    """
+    OAuth2 compatible token login, get an access token for future requests.
+    """
+    user = auth_service.authenticate_user(db, form_data.username, form_data.password)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    return auth_service.create_token(user)
+
+@router.get("/me", response_model=User)
+def read_users_me(current_user: User = Depends(auth_service.get_current_user)):
+    """
+    Get current user information.
+    """
+    return current_user
\ No newline at end of file
diff --git a/app/api/v1/endpoints/users.py b/app/api/v1/endpoints/users.py
new file mode 100644
index 0000000..e225452
--- /dev/null
+++ b/app/api/v1/endpoints/users.py
@@ -0,0 +1,104 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import List
+
+from app.db.database import get_db
+from app.db.repositories import user_repository
+from app.schemas.user import User, UserUpdate
+from app.services.auth_service import auth_service
+from app.models.user import User as UserModel
+
+router = APIRouter()
+
+@router.get("/", response_model=List[User])
+def read_users(
+    skip: int = 0, 
+    limit: int = 100, 
+    db: Session = Depends(get_db),
+    current_user: UserModel = Depends(auth_service.get_current_user)
+):
+    """
+    Retrieve users. Only authenticated users can see the list.
+    """
+    users = user_repository.list(db, skip=skip, limit=limit)
+    return users
+
+@router.get("/{user_id}", response_model=User)
+def read_user(
+    user_id: int, 
+    db: Session = Depends(get_db),
+    current_user: UserModel = Depends(auth_service.get_current_user)
+):
+    """
+    Get a specific user by id.
+    """
+    db_user = user_repository.get_by_id(db, user_id)
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    return db_user
+
+@router.put("/{user_id}", response_model=User)
+def update_user(
+    user_id: int, 
+    user_in: UserUpdate, 
+    db: Session = Depends(get_db),
+    current_user: UserModel = Depends(auth_service.get_current_user)
+):
+    """
+    Update a user. Users can only update their own information.
+    """
+    # Only allow users to update their own information
+    if current_user.id != user_id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+        
+    db_user = user_repository.get_by_id(db, user_id)
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    # Check for email uniqueness if changing email
+    if user_in.email and user_in.email != db_user.email:
+        existing_user = user_repository.get_by_email(db, user_in.email)
+        if existing_user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered"
+            )
+    
+    # Check for username uniqueness if changing username
+    if user_in.username and user_in.username != db_user.username:
+        existing_user = user_repository.get_by_username(db, user_in.username)
+        if existing_user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Username already taken"
+            )
+    
+    user_data = user_in.model_dump(exclude_unset=True)
+    updated_user = user_repository.update(db, db_user, user_data)
+    return updated_user
+
+@router.delete("/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
+def delete_user(
+    user_id: int, 
+    db: Session = Depends(get_db),
+    current_user: UserModel = Depends(auth_service.get_current_user)
+):
+    """
+    Delete a user. Users can only delete their own account.
+    """
+    # Only allow users to delete their own account
+    if current_user.id != user_id:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+        
+    db_user = user_repository.get_by_id(db, user_id)
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    user_repository.delete(db, db_user)
+    return None
\ No newline at end of file
diff --git a/app/api/v1/routes.py b/app/api/v1/routes.py
new file mode 100644
index 0000000..a031ef8
--- /dev/null
+++ b/app/api/v1/routes.py
@@ -0,0 +1,8 @@
+from fastapi import APIRouter
+from app.api.v1.endpoints import auth, users
+
+router = APIRouter()
+
+# Include sub-routers
+router.include_router(auth.router, prefix="/auth", tags=["authentication"])
+router.include_router(users.router, prefix="/users", tags=["users"])
\ No newline at end of file
diff --git a/app/core/__init__.py b/app/core/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/core/config.py b/app/core/config.py
new file mode 100644
index 0000000..6de0198
--- /dev/null
+++ b/app/core/config.py
@@ -0,0 +1,21 @@
+from pydantic_settings import BaseSettings
+import secrets
+from typing import Optional
+
+
+class Settings(BaseSettings):
+    # API settings
+    API_V1_STR: str = "/api/v1"
+    
+    # Security settings
+    SECRET_KEY: str = secrets.token_urlsafe(32)
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    
+    # CORS settings
+    BACKEND_CORS_ORIGINS: list[str] = ["*"]
+    
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+        
+settings = Settings()
\ No newline at end of file
diff --git a/app/core/security.py b/app/core/security.py
new file mode 100644
index 0000000..027b62e
--- /dev/null
+++ b/app/core/security.py
@@ -0,0 +1,25 @@
+from datetime import datetime, timedelta
+from typing import Any, Union, Optional
+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: Optional[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)
\ No newline at end of file
diff --git a/app/db/__init__.py b/app/db/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/db/database.py b/app/db/database.py
new file mode 100644
index 0000000..44088a8
--- /dev/null
+++ b/app/db/database.py
@@ -0,0 +1,27 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+# Create DB directory if it doesn't exist
+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)
+
+Base = declarative_base()
+
+# Dependency to get DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
\ No newline at end of file
diff --git a/app/db/repositories/__init__.py b/app/db/repositories/__init__.py
new file mode 100644
index 0000000..a4cc678
--- /dev/null
+++ b/app/db/repositories/__init__.py
@@ -0,0 +1,5 @@
+from app.db.repositories.user_repository import UserRepository
+
+user_repository = UserRepository()
+
+__all__ = ["user_repository"]
\ No newline at end of file
diff --git a/app/db/repositories/user_repository.py b/app/db/repositories/user_repository.py
new file mode 100644
index 0000000..727088e
--- /dev/null
+++ b/app/db/repositories/user_repository.py
@@ -0,0 +1,35 @@
+from sqlalchemy.orm import Session
+from app.models.user import User
+from app.schemas.user import UserCreate
+from typing import Optional
+
+class UserRepository:
+    def get_by_id(self, db: Session, user_id: int) -> Optional[User]:
+        return db.query(User).filter(User.id == user_id).first()
+    
+    def get_by_email(self, db: Session, email: str) -> Optional[User]:
+        return db.query(User).filter(User.email == email).first()
+        
+    def get_by_username(self, db: Session, username: str) -> Optional[User]:
+        return db.query(User).filter(User.username == username).first()
+    
+    def create(self, db: Session, user_data: dict) -> User:
+        user = User(**user_data)
+        db.add(user)
+        db.commit()
+        db.refresh(user)
+        return user
+        
+    def update(self, db: Session, user: User, user_data: dict) -> User:
+        for key, value in user_data.items():
+            setattr(user, key, value)
+        db.commit()
+        db.refresh(user)
+        return user
+        
+    def delete(self, db: Session, user: User) -> None:
+        db.delete(user)
+        db.commit()
+        
+    def list(self, db: Session, skip: int = 0, limit: int = 100):
+        return db.query(User).offset(skip).limit(limit).all()
\ No newline at end of file
diff --git a/app/middlewares/__init__.py b/app/middlewares/__init__.py
new file mode 100644
index 0000000..135fe5a
--- /dev/null
+++ b/app/middlewares/__init__.py
@@ -0,0 +1,3 @@
+from app.middlewares.auth import AuthMiddleware
+
+__all__ = ["AuthMiddleware"]
\ No newline at end of file
diff --git a/app/middlewares/auth.py b/app/middlewares/auth.py
new file mode 100644
index 0000000..77d31f8
--- /dev/null
+++ b/app/middlewares/auth.py
@@ -0,0 +1,51 @@
+from fastapi import Request, HTTPException, status, Depends
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
+from starlette.responses import Response
+
+from app.core.config import settings
+from app.core.security import ALGORITHM
+
+# Define a simple middleware class for global JWT verification (if needed)
+class AuthMiddleware(BaseHTTPMiddleware):
+    async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -> Response:
+        # Skip auth for certain paths
+        if self._should_skip_auth(request.url.path):
+            return await call_next(request)
+        
+        # Get the Authorization header
+        auth_header = request.headers.get("Authorization")
+        if not auth_header or not auth_header.startswith("Bearer "):
+            # If no auth header, proceed without user context (endpoints will handle auth as needed)
+            return await call_next(request)
+        
+        # Extract the token
+        token = auth_header.replace("Bearer ", "")
+        
+        try:
+            # Verify token and get payload
+            payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[ALGORITHM])
+            user_id = payload.get("sub")
+            
+            # Attach user ID to request state for use in endpoint handlers
+            request.state.user_id = user_id
+        except JWTError:
+            # If token is invalid, proceed without user context
+            pass
+        
+        # Continue processing the request
+        return await call_next(request)
+    
+    def _should_skip_auth(self, path: str) -> bool:
+        """Paths that don't require authentication check."""
+        skip_paths = [
+            "/docs",
+            "/redoc",
+            "/openapi.json",
+            f"{settings.API_V1_STR}/auth/login",
+            f"{settings.API_V1_STR}/auth/register",
+            "/health",
+        ]
+        
+        return any(path.startswith(skip_path) for skip_path in skip_paths)
\ No newline at end of file
diff --git a/app/models/__init__.py b/app/models/__init__.py
new file mode 100644
index 0000000..10d6bae
--- /dev/null
+++ b/app/models/__init__.py
@@ -0,0 +1,3 @@
+from app.models.user import User
+
+__all__ = ["User"]
\ No newline at end of file
diff --git a/app/models/user.py b/app/models/user.py
new file mode 100644
index 0000000..e2bbeac
--- /dev/null
+++ b/app/models/user.py
@@ -0,0 +1,14 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy.sql import func
+from app.db.database import Base
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
\ No newline at end of file
diff --git a/app/schemas/__init__.py b/app/schemas/__init__.py
new file mode 100644
index 0000000..133092d
--- /dev/null
+++ b/app/schemas/__init__.py
@@ -0,0 +1,3 @@
+from app.schemas.user import UserBase, UserCreate, UserLogin, UserUpdate, User, Token, TokenData
+
+__all__ = ["UserBase", "UserCreate", "UserLogin", "UserUpdate", "User", "Token", "TokenData"]
\ No newline at end of file
diff --git a/app/schemas/user.py b/app/schemas/user.py
new file mode 100644
index 0000000..5436328
--- /dev/null
+++ b/app/schemas/user.py
@@ -0,0 +1,34 @@
+from pydantic import BaseModel, EmailStr, Field
+from typing import Optional
+from datetime import datetime
+
+class UserBase(BaseModel):
+    email: EmailStr
+    username: str = Field(..., min_length=3, max_length=50)
+    
+class UserCreate(UserBase):
+    password: str = Field(..., min_length=8)
+    
+class UserLogin(BaseModel):
+    email: EmailStr
+    password: str
+    
+class UserUpdate(BaseModel):
+    email: Optional[EmailStr] = None
+    username: Optional[str] = Field(None, min_length=3, max_length=50)
+    
+class User(UserBase):
+    id: int
+    is_active: bool
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    
+    class Config:
+        from_attributes = True
+        
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+    
+class TokenData(BaseModel):
+    user_id: Optional[int] = None
\ No newline at end of file
diff --git a/app/services/__init__.py b/app/services/__init__.py
new file mode 100644
index 0000000..28cb49c
--- /dev/null
+++ b/app/services/__init__.py
@@ -0,0 +1,3 @@
+from app.services.auth_service import auth_service
+
+__all__ = ["auth_service"]
\ No newline at end of file
diff --git a/app/services/auth_service.py b/app/services/auth_service.py
new file mode 100644
index 0000000..4ecbf17
--- /dev/null
+++ b/app/services/auth_service.py
@@ -0,0 +1,79 @@
+from fastapi import Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import Optional
+from datetime import timedelta
+from jose import JWTError, jwt
+from fastapi.security import OAuth2PasswordBearer
+
+from app.db.database import get_db
+from app.db.repositories import user_repository
+from app.models.user import User
+from app.schemas.user import UserCreate, UserLogin, TokenData
+from app.core.security import verify_password, get_password_hash, create_access_token, ALGORITHM
+from app.core.config import settings
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+class AuthService:
+    def authenticate_user(self, db: Session, email: str, password: str) -> Optional[User]:
+        user = user_repository.get_by_email(db, email)
+        if not user:
+            return None
+        if not verify_password(password, user.hashed_password):
+            return None
+        return user
+    
+    def register_user(self, db: Session, user_in: UserCreate) -> User:
+        # Check if email already exists
+        db_user = user_repository.get_by_email(db, user_in.email)
+        if db_user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Email already registered"
+            )
+            
+        # Check if username already exists
+        db_user = user_repository.get_by_username(db, user_in.username)
+        if db_user:
+            raise HTTPException(
+                status_code=status.HTTP_400_BAD_REQUEST,
+                detail="Username already taken"
+            )
+            
+        # Create new user
+        hashed_password = get_password_hash(user_in.password)
+        user_data = user_in.model_dump(exclude={"password"})
+        user_data["hashed_password"] = hashed_password
+        
+        return user_repository.create(db, user_data)
+    
+    def create_token(self, user: User) -> dict:
+        access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+        access_token = create_access_token(
+            subject=user.id, expires_delta=access_token_expires
+        )
+        return {"access_token": access_token, "token_type": "bearer"}
+    
+    def get_current_user(self, db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)) -> User:
+        credentials_exception = HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+        
+        try:
+            payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[ALGORITHM])
+            user_id: str = payload.get("sub")
+            if user_id is None:
+                raise credentials_exception
+            token_data = TokenData(user_id=int(user_id))
+        except JWTError:
+            raise credentials_exception
+            
+        user = user_repository.get_by_id(db, token_data.user_id)
+        if user is None:
+            raise credentials_exception
+            
+        return user
+
+auth_service = AuthService()
\ No newline at end of file
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..a709bf7
--- /dev/null
+++ b/main.py
@@ -0,0 +1,31 @@
+from fastapi import FastAPI
+from app.api.v1.routes import router as v1_router
+from app.middlewares.auth import AuthMiddleware
+from fastapi.middleware.cors import CORSMiddleware
+
+app = FastAPI(
+    title="User Authentication Service",
+    description="A service for user authentication with JWT tokens",
+    version="0.1.0",
+)
+
+# Add CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # In production, specify the allowed origins
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API routes
+app.include_router(v1_router, prefix="/api/v1")
+
+# Health check endpoint
+@app.get("/health", tags=["Health"])
+async def health_check():
+    return {"status": "healthy"}
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..75d82d0
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,13 @@
+fastapi==0.103.1
+uvicorn==0.23.2
+sqlalchemy==2.0.20
+pydantic==2.3.0
+pydantic-settings==2.0.3
+python-jose==3.3.0
+passlib==1.7.4
+bcrypt==4.0.1
+python-multipart==0.0.6
+email-validator==2.0.0
+alembic==1.12.0
+python-dotenv==1.0.0
+pathlib==1.0.1
\ No newline at end of file