diff --git a/backend/app/api/__init__.py b/backend/app/api/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/api/auth.py b/backend/app/api/auth.py
new file mode 100644
index 0000000..8fd1acf
--- /dev/null
+++ b/backend/app/api/auth.py
@@ -0,0 +1,38 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.database import get_db
+from app.schemas.user import Token, UserCreate, UserLogin, UserResponse
+from app.services.auth import (
+    create_access_token,
+    create_user,
+    get_user_by_username,
+    verify_password,
+)
+from app.api.deps import get_current_user
+from app.models.user import User
+
+router = APIRouter(prefix="/api/auth", tags=["auth"])
+
+
+@router.post("/register", response_model=UserResponse, status_code=201)
+async def register(data: UserCreate, db: AsyncSession = Depends(get_db)):
+    existing = await get_user_by_username(db, data.username)
+    if existing:
+        raise HTTPException(status_code=400, detail="Username already taken")
+    user = await create_user(db, data.username, data.email, data.password)
+    return user
+
+
+@router.post("/login", response_model=Token)
+async def login(data: UserLogin, db: AsyncSession = Depends(get_db)):
+    user = await get_user_by_username(db, data.username)
+    if not user or not verify_password(data.password, user.password_hash):
+        raise HTTPException(status_code=401, detail="Invalid credentials")
+    token = create_access_token(str(user.id))
+    return Token(access_token=token)
+
+
+@router.get("/me", response_model=UserResponse)
+async def me(user: User = Depends(get_current_user)):
+    return user
diff --git a/backend/app/api/deps.py b/backend/app/api/deps.py
new file mode 100644
index 0000000..2a01195
--- /dev/null
+++ b/backend/app/api/deps.py
@@ -0,0 +1,28 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.database import get_db
+from app.models.user import User
+from app.services.auth import decode_access_token
+
+security = HTTPBearer()
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: AsyncSession = Depends(get_db),
+) -> User:
+    user_id = decode_access_token(credentials.credentials)
+    if user_id is None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token"
+        )
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    if user is None or not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found"
+        )
+    return user
diff --git a/backend/app/main.py b/backend/app/main.py
new file mode 100644
index 0000000..d04dfd3
--- /dev/null
+++ b/backend/app/main.py
@@ -0,0 +1,19 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+from app.api.auth import router as auth_router
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    yield
+
+
+app = FastAPI(title="Meeting Protocol Service", lifespan=lifespan)
+app.include_router(auth_router)
+
+
+@app.get("/api/health")
+async def health():
+    return {"status": "ok"}
diff --git a/backend/app/schemas/__init__.py b/backend/app/schemas/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/schemas/user.py b/backend/app/schemas/user.py
new file mode 100644
index 0000000..d72e74b
--- /dev/null
+++ b/backend/app/schemas/user.py
@@ -0,0 +1,33 @@
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, EmailStr
+
+from app.models.user import UserRole
+
+
+class UserCreate(BaseModel):
+    username: str
+    email: str
+    password: str
+
+
+class UserLogin(BaseModel):
+    username: str
+    password: str
+
+
+class UserResponse(BaseModel):
+    id: uuid.UUID
+    username: str
+    email: str
+    role: UserRole
+    is_active: bool
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
diff --git a/backend/app/services/__init__.py b/backend/app/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/services/auth.py b/backend/app/services/auth.py
new file mode 100644
index 0000000..f91d7d4
--- /dev/null
+++ b/backend/app/services/auth.py
@@ -0,0 +1,52 @@
+from datetime import datetime, timedelta, timezone
+
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.config import settings
+from app.models.user import User
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+
+def create_access_token(user_id: str) -> str:
+    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
+    payload = {"sub": user_id, "exp": expire}
+    return jwt.encode(payload, settings.jwt_secret, algorithm=settings.jwt_algorithm)
+
+
+def decode_access_token(token: str) -> str | None:
+    try:
+        payload = jwt.decode(
+            token, settings.jwt_secret, algorithms=[settings.jwt_algorithm]
+        )
+        return payload.get("sub")
+    except JWTError:
+        return None
+
+
+async def get_user_by_username(db: AsyncSession, username: str) -> User | None:
+    result = await db.execute(select(User).where(User.username == username))
+    return result.scalar_one_or_none()
+
+
+async def create_user(db: AsyncSession, username: str, email: str, password: str) -> User:
+    user = User(
+        username=username,
+        email=email,
+        password_hash=hash_password(password),
+    )
+    db.add(user)
+    await db.commit()
+    await db.refresh(user)
+    return user
diff --git a/backend/tests/__init__.py b/backend/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/tests/conftest.py b/backend/tests/conftest.py
new file mode 100644
index 0000000..902aca8
--- /dev/null
+++ b/backend/tests/conftest.py
@@ -0,0 +1,64 @@
+import asyncio
+import uuid
+
+import pytest
+import pytest_asyncio
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+
+from app.config import settings
+from app.database import get_db
+from app.main import app
+from app.models import Base
+from app.services.auth import create_access_token
+
+TEST_DB_URL = settings.database_url.replace("/meetproto", "/meetproto_test")
+
+engine_test = create_async_engine(TEST_DB_URL, echo=False)
+async_session_test = async_sessionmaker(engine_test, expire_on_commit=False)
+
+
+@pytest.fixture(scope="session")
+def event_loop():
+    loop = asyncio.new_event_loop()
+    yield loop
+    loop.close()
+
+
+@pytest_asyncio.fixture(autouse=True)
+async def setup_db():
+    async with engine_test.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+    yield
+    async with engine_test.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+
+
+async def override_get_db():
+    async with async_session_test() as session:
+        yield session
+
+
+app.dependency_overrides[get_db] = override_get_db
+
+
+@pytest_asyncio.fixture
+async def client():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as c:
+        yield c
+
+
+@pytest_asyncio.fixture
+async def auth_client(client: AsyncClient):
+    resp = await client.post("/api/auth/register", json={
+        "username": f"testuser_{uuid.uuid4().hex[:8]}",
+        "email": f"test_{uuid.uuid4().hex[:8]}@example.com",
+        "password": "testpass123",
+    })
+    token = (await client.post("/api/auth/login", json={
+        "username": resp.json()["username"],
+        "password": "testpass123",
+    })).json()["access_token"]
+    client.headers["Authorization"] = f"Bearer {token}"
+    yield client
diff --git a/backend/tests/test_auth.py b/backend/tests/test_auth.py
new file mode 100644
index 0000000..1df1d1e
--- /dev/null
+++ b/backend/tests/test_auth.py
@@ -0,0 +1,66 @@
+import pytest
+from httpx import AsyncClient
+
+
+@pytest.mark.asyncio
+async def test_register_success(client: AsyncClient):
+    resp = await client.post("/api/auth/register", json={
+        "username": "newuser",
+        "email": "new@example.com",
+        "password": "pass123",
+    })
+    assert resp.status_code == 201
+    data = resp.json()
+    assert data["username"] == "newuser"
+    assert data["role"] == "user"
+    assert "password" not in data
+
+
+@pytest.mark.asyncio
+async def test_register_duplicate(client: AsyncClient):
+    payload = {"username": "dupuser", "email": "dup@example.com", "password": "pass123"}
+    await client.post("/api/auth/register", json=payload)
+    resp = await client.post("/api/auth/register", json=payload)
+    assert resp.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_login_success(client: AsyncClient):
+    await client.post("/api/auth/register", json={
+        "username": "loginuser",
+        "email": "login@example.com",
+        "password": "pass123",
+    })
+    resp = await client.post("/api/auth/login", json={
+        "username": "loginuser",
+        "password": "pass123",
+    })
+    assert resp.status_code == 200
+    assert "access_token" in resp.json()
+
+
+@pytest.mark.asyncio
+async def test_login_wrong_password(client: AsyncClient):
+    await client.post("/api/auth/register", json={
+        "username": "wrongpw",
+        "email": "wrongpw@example.com",
+        "password": "pass123",
+    })
+    resp = await client.post("/api/auth/login", json={
+        "username": "wrongpw",
+        "password": "wrong",
+    })
+    assert resp.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_me_authenticated(auth_client: AsyncClient):
+    resp = await auth_client.get("/api/auth/me")
+    assert resp.status_code == 200
+    assert "username" in resp.json()
+
+
+@pytest.mark.asyncio
+async def test_me_unauthenticated(client: AsyncClient):
+    resp = await client.get("/api/auth/me")
+    assert resp.status_code == 403