diff --git a/backend/.env b/backend/.env
new file mode 100644
index 0000000..b32e7a0
--- /dev/null
+++ b/backend/.env
@@ -0,0 +1,10 @@
+DB_URL=mysql+pymysql://admin:55ii.P4I.1;@miarma.net:3307/cai3
+SECRET_KEY=77ea2fd1f4145c4b73a0d0e5b4f97c1dc175d7cd2ec6c75d22afaafe99a15380
+ALGORITHM=HS256
+EXPIRATION=86400
+
+TOTP_INTERVAL=30
+TOTP_DIGITS=6
+TOTP_ALGORITHM=SHA1
+TOTP_ISSUER=SSII2FA
+TOTP_NAME_PREFIX=user
\ No newline at end of file
diff --git a/backend/.gitignore b/backend/.gitignore
new file mode 100644
index 0000000..5ce6c91
--- /dev/null
+++ b/backend/.gitignore
@@ -0,0 +1,7 @@
+cai3/*
+app/__pycache__/*
+app/core/__pycache__/*
+app/db/__pycache__/*
+app/models/__pycache__/*
+app/routes/__pycache__/*
+app/schemas/__pycache__/*
\ No newline at end of file
diff --git a/backend/app/__init__.py b/backend/app/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/core/__init__.py b/backend/app/core/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/core/config.py b/backend/app/core/config.py
new file mode 100644
index 0000000..c91d2d9
--- /dev/null
+++ b/backend/app/core/config.py
@@ -0,0 +1,22 @@
+from pydantic_settings import BaseSettings
+from dotenv import load_dotenv
+import os
+
+load_dotenv()
+
+class Settings(BaseSettings):
+    DB_URL: str = os.getenv('DB_URL')
+    SECRET_KEY: str = os.getenv('SECRET_KEY')
+    ALGORITHM: str = os.getenv('ALGORITHM', 'HS256')
+    EXPIRATION: int = int(os.getenv('EXPIRATION', 86400))
+    
+    TOTP_INTERVAL: int = int(os.getenv('TOTP_INTERVAL', 30))
+    TOTP_DIGITS: int = int(os.getenv('TOTP_DIGITS', 6))
+    TOTP_ALGORITHM: str = os.getenv('TOTP_ALGORITHM', 'SHA1')
+    TOTP_ISSUER: str = os.getenv('TOTP_ISSUER', 'SSII2FA')
+    TOTP_NAME_PREFIX: str = os.getenv('TOTP_NAME_PREFIX', 'user')
+    
+    class Config:
+        env_file = ".env"
+        
+settings = Settings()
\ No newline at end of file
diff --git a/backend/app/core/security.py b/backend/app/core/security.py
new file mode 100644
index 0000000..10186ba
--- /dev/null
+++ b/backend/app/core/security.py
@@ -0,0 +1,35 @@
+from passlib.context import CryptContext
+from datetime import datetime, timedelta, timezone
+from app.core.config import settings
+import jwt
+from fastapi import HTTPException, status
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+def generate_jwt(data: dict, expires: timedelta | None = None):
+    to_encode = data.copy()
+    if expires:
+        expire = datetime.now(timezone.utc) + expires
+    else:
+        expire = datetime.now(timezone.utc) + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def verify_jwt(token: str):
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        return payload
+    except jwt.PyJWTError:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Token inválido o expirado",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
\ No newline at end of file
diff --git a/backend/app/db/__init__.py b/backend/app/db/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/db/database.py b/backend/app/db/database.py
new file mode 100644
index 0000000..eeaa71c
--- /dev/null
+++ b/backend/app/db/database.py
@@ -0,0 +1,18 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+from app.core.config import settings
+
+engine = create_engine(
+    settings.DB_URL,
+    pool_pre_ping=True,
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
\ No newline at end of file
diff --git a/backend/app/main.py b/backend/app/main.py
new file mode 100644
index 0000000..998e07a
--- /dev/null
+++ b/backend/app/main.py
@@ -0,0 +1,16 @@
+from typing import Union
+from fastapi import FastAPI
+from app.routes import users, auth
+
+"""
+    ENDPOINTS:
+    GET /users/
+    GET /users/{user_id}
+    POST /users
+    POST /2fa
+"""
+app = FastAPI(title="FastAPI + MariaDB + 2FA Example")
+
+# Registramos las rutas
+app.include_router(users.router, tags=["Users"])
+app.include_router(auth.router, tags=["Authentication"])
\ No newline at end of file
diff --git a/backend/app/models/__init__.py b/backend/app/models/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/models/user.py b/backend/app/models/user.py
new file mode 100644
index 0000000..b140785
--- /dev/null
+++ b/backend/app/models/user.py
@@ -0,0 +1,10 @@
+from sqlalchemy import Column, Integer, String, Boolean
+from app.db.database import Base
+
+class UserModel(Base):
+    __tablename__ = "users"
+    user_id = Column(Integer, primary_key=True, autoincrement=True)
+    user_name = Column(String(64), unique=True, nullable=False)
+    password = Column(String(256), nullable=False)
+    totp_secret = Column(String(32), nullable=True)
+    has_2fa = Column(Boolean(False), default=False, nullable=False)
\ No newline at end of file
diff --git a/backend/app/routes/__init__.py b/backend/app/routes/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/routes/auth.py b/backend/app/routes/auth.py
new file mode 100644
index 0000000..31313f0
--- /dev/null
+++ b/backend/app/routes/auth.py
@@ -0,0 +1,121 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from app.db.database import get_db
+from app.models.user import UserModel
+from app.schemas.user import UserLogin, User2FA, Token2FA
+from app.core.security import verify_password, generate_jwt, verify_jwt
+from datetime import timedelta
+import hashlib
+import pyotp
+from app.core.config import settings
+import qrcode
+import io
+import base64
+
+router = APIRouter()
+
+def get_digest_function(algorithm: str):
+    algo = algorithm.upper()
+    if algo == "SHA256":
+        return hashlib.sha256
+    elif algo == "SHA512":
+        return hashlib.sha512
+    else:
+        return hashlib.sha1
+
+@router.post("/login")
+def login(user: UserLogin, db: Session = Depends(get_db)):
+    existing_user = db.query(UserModel).filter(UserModel.user_name == user.user_name).first()
+    if not existing_user:
+        raise HTTPException(status_code=404, detail="El usuario no existe")
+    
+    if not verify_password(user.password, existing_user.password):
+        raise HTTPException(status_code=401, detail="Credenciales inválidas")
+    
+    pre_auth_token = generate_jwt(
+        data={"user_id": existing_user.user_id, "scope": "pre_auth"},
+        expires=timedelta(minutes=2)
+    )
+    
+    return {"pre_auth_token": pre_auth_token}
+
+@router.post("/2fa")
+def two_factor_auth(user_2fa: User2FA, db: Session = Depends(get_db)):
+    token = verify_jwt(user_2fa.pre_auth_token)
+    user_id = token.get("user_id")
+    if not user_id:
+        raise HTTPException(status_code=401, detail="Token inválido o expirado")
+    
+    user = db.query(UserModel).filter(UserModel.user_id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="Usuario no encontrado")
+
+    digest_func = get_digest_function(settings.TOTP_ALGORITHM)
+    totp = pyotp.TOTP(
+        s=user.totp_secret,
+        digits=settings.TOTP_DIGITS,
+        digest=digest_func,
+        interval=settings.TOTP_INTERVAL,
+        issuer=settings.TOTP_ISSUER,
+        name=f"{settings.TOTP_NAME_PREFIX}:{user.user_name}"
+    )
+    
+    if not totp.verify(user_2fa.totp_code):
+        raise HTTPException(status_code=401, detail="Código 2FA inválido")
+
+    expires = timedelta(seconds=settings.EXPIRATION)
+    token = generate_jwt(
+        data={"user_id": user.user_id, "user_name": user.user_name, "scope": "2fa_authenticated"},
+        expires=expires
+    )
+
+    return {
+        "access_token": token,
+        "token_type": "bearer",
+        "message": "Autenticación 2FA exitosa"
+    }
+    
+@router.post("/enable-2fa")
+def enable_2fa(token2fa: Token2FA, db: Session = Depends(get_db)):
+    token = verify_jwt(token2fa.token)
+    user_id = token.get("user_id")
+    if not user_id:
+        raise HTTPException(status_code=401, detail="Token inválido o expirado")
+
+    user = db.query(UserModel).filter(UserModel.user_id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="Usuario no encontrado")
+
+    secret = pyotp.random_base32()
+    user.totp_secret = secret
+    db.commit()
+
+    digest_func = get_digest_function(settings.TOTP_ALGORITHM)
+
+    totp = pyotp.TOTP(
+        s=secret,
+        digits=settings.TOTP_DIGITS,
+        digest=digest_func,
+        interval=settings.TOTP_INTERVAL,
+        issuer=settings.TOTP_ISSUER,
+        name=f"{settings.TOTP_NAME_PREFIX}:{user.user_name}"
+    )
+
+    otpauth_url = totp.provisioning_uri(
+        name=f"{settings.TOTP_NAME_PREFIX}:{user.user_name}",
+        issuer_name=settings.TOTP_ISSUER
+    )
+    
+    qr = qrcode.make(otpauth_url)
+    buf = io.BytesIO()
+    qr.save(buf, format="PNG")
+    img_base64 = base64.b64encode(buf.getvalue()).decode("utf-8")
+
+    return {
+        "user_id": user.user_id,
+        "user_name": user.user_name,
+        "totp_secret": secret,
+        "otpauth_url": otpauth_url,
+        "qr_base64": img_base64,
+        "message": "2FA habilitado correctamente. Escanea el QR o introduce el código en tu app de autenticación."
+    }
\ No newline at end of file
diff --git a/backend/app/routes/users.py b/backend/app/routes/users.py
new file mode 100644
index 0000000..84ce5af
--- /dev/null
+++ b/backend/app/routes/users.py
@@ -0,0 +1,44 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from typing import List
+from app.db.database import get_db
+from app.models.user import UserModel
+from app.schemas.user import UserRead, UserRegister
+from app.core.security import hash_password
+import pyotp
+
+router = APIRouter()
+
+@router.get("/users", response_model=List[UserRead])
+def get_all_users(db: Session = Depends(get_db)):
+    users = db.query(UserModel).all()
+    if not users:
+        raise HTTPException(status_code=404, detail="No hay usuarios registrados")
+    return users
+
+@router.get("/users/{user_id}", response_model=UserRead)
+def get_user_by_id(user_id: int, db: Session = Depends(get_db)):
+    user = db.query(UserModel).filter(UserModel.user_id == user_id).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="No se ha encontrado el usuario.")
+    
+    return user
+
+@router.post("/users", response_model=UserRead)
+async def create_user(user: UserRegister, db: Session = Depends(get_db)):
+    existing_user = db.query(UserModel).filter(UserModel.user_name == user.user_name).first()
+    if existing_user:
+        raise HTTPException(status_code=400, detail="El nombre de usuario ya existe")
+
+    hashed_password = hash_password(user.password)
+
+    new_user = UserModel(
+        user_name=user.user_name,
+        password=hashed_password,
+    )
+
+    db.add(new_user)
+    db.commit()
+    db.refresh(new_user)
+
+    return new_user
\ No newline at end of file
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..cc98fb3
--- /dev/null
+++ b/backend/app/schemas/user.py
@@ -0,0 +1,31 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+
+# POST /login
+class UserLogin(BaseModel):
+    user_name: str
+    password: str
+
+# POST /register
+class UserRegister(BaseModel):
+    user_name: str
+    password: str
+
+# POST /2fa
+class User2FA(BaseModel):
+    user_name: str
+    pre_auth_token: str
+    totp_code: str
+    
+# POST /enable-2fa
+class Token2FA(BaseModel):
+    token: str
+
+# GET /users
+# GET /users/{user_id}
+class UserRead(BaseModel):
+    user_id: int
+    user_name: str
+    
+    class Config:
+        from_attributes = True
\ No newline at end of file
diff --git a/backend/requirements.txt b/backend/requirements.txt
new file mode 100644
index 0000000..db7a422
--- /dev/null
+++ b/backend/requirements.txt
@@ -0,0 +1,13 @@
+uvicorn
+fastapi
+sqlalchemy
+pymysql
+pydantic
+pydantic_settings
+dotenv
+pyotp
+passlib
+PyJWT
+bcrypt
+qrcode
+pillow
\ No newline at end of file
diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index a4cfc0b..711b655 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -3,7 +3,9 @@ import 'bootstrap/dist/js/bootstrap.bundle.min.js'
 
 const App = () => {
   return (
-    <></>
+    <>
+      
+    </>
   )
 }