diff --git a/backend/.env b/backend/.env
new file mode 100644
index 00000000..58d19034
--- /dev/null
+++ b/backend/.env
@@ -0,0 +1,12 @@
+PORT=3005
+DB_HOST=localhost
+DB_USERNAME=postgres
+DB_PASSWORD=123123
+DB_DATABASE=postgres
+CLIENT_HOST=http://localhost:5173
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=465
+SMTP_USER=marusina.yana@gmail.com
+SMTP_PASSWORD=wxqncsyrseiamdtm
+JWT_SECRET = access_secret;
+JWT_REFRESH_SECRET = refresh_secret;
diff --git a/backend/package-lock.json b/backend/package-lock.json
new file mode 100644
index 00000000..a0dea5ad
--- /dev/null
+++ b/backend/package-lock.json
@@ -0,0 +1,1416 @@
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+      "license": "MIT"
+    },
+    "node_modules/type-is": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
+      "integrity": "sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==",
+      "license": "MIT",
+      "dependencies": {
+        "content-type": "^1.0.5",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/underscore": {
+      "version": "1.13.8",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.8.tgz",
+      "integrity": "sha512-DXtD3ZtEQzc7M8m4cXotyHR+FAS18C64asBYY5vqZexfYryNNnDc02W4hKg3rdQuqOYas1jkseX0+nZXjTXnvQ==",
+      "license": "MIT"
+    },
+    "node_modules/undici-types": {
+      "version": "7.19.2",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.19.2.tgz",
+      "integrity": "sha512-qYVnV5OEm2AW8cJMCpdV20CDyaN3g0AjDlOGf1OW4iaDEx8MwdtChUp4zu4H0VP3nDRF/8RKWH+IPp9uW0YGZg==",
+      "license": "MIT"
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/uuid": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-14.0.0.tgz",
+      "integrity": "sha512-Qo+uWgilfSmAhXCMav1uYFynlQO7fMFiMVZsQqZRMIXp0O7rR7qjkj+cPvBHLgBqi960QCoo/PH2/6ZtVqKvrg==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist-node/bin/uuid"
+      }
+    },
+    "node_modules/validator": {
+      "version": "13.15.35",
+      "resolved": "https://registry.npmjs.org/validator/-/validator-13.15.35.tgz",
+      "integrity": "sha512-TQ5pAGhd5whStmqWvYF4OjQROlmv9SMFVt37qoCBdqRffuuklWYQlCNnEs2ZaIBD1kZRNnikiZOS1eqgkar0iw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/wkx": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/wkx/-/wkx-0.5.0.tgz",
+      "integrity": "sha512-Xng/d4Ichh8uN4l0FToV/258EjMGU9MGcA0HV2d9B/ZpZB3lqQm7nkOdZdm5GhKtLLhAE7PiVQwN4eN+2YJJUg==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    },
+    "node_modules/xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4"
+      }
+    }
+  }
+}
diff --git a/backend/package.json b/backend/package.json
new file mode 100644
index 00000000..3800cc87
--- /dev/null
+++ b/backend/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "bcrypt": "^6.0.0",
+    "cors": "^2.8.6",
+    "dotenv": "^17.4.2",
+    "express": "^5.2.1",
+    "jsonwebtoken": "^9.0.3",
+    "nodemailer": "^8.0.7",
+    "pg": "^8.20.0",
+    "pg-hstore": "^2.3.4",
+    "sequelize": "^6.37.8",
+    "uuid": "^14.0.0"
+  }
+}
diff --git a/backend/src/config/db.js b/backend/src/config/db.js
new file mode 100644
index 00000000..c0e6ffd1
--- /dev/null
+++ b/backend/src/config/db.js
@@ -0,0 +1,11 @@
+import { Sequelize } from 'sequelize';
+
+const sequelize = new Sequelize({
+  host: process.env.DB_HOST,
+  username: process.env.DB_USERNAME,
+  password: process.env.DB_PASSWORD,
+  database: process.env.DB_DATABASE,
+  dialect: 'postgres',
+});
+
+export default sequelize;
diff --git a/backend/src/controllers/authController.js b/backend/src/controllers/authController.js
new file mode 100644
index 00000000..359a62aa
--- /dev/null
+++ b/backend/src/controllers/authController.js
@@ -0,0 +1,192 @@
+/* eslint-disable curly */
+/* eslint-disable no-console */
+import bcrypt from 'bcrypt';
+import jwt from 'jsonwebtoken';
+import { User } from '../models/User.js';
+import { v4 as uuidv4 } from 'uuid';
+import { sendActivationEmail } from '../services/emailService.js';
+
+const validatePassword = (password) => {
+  if (!password) {
+    throw new Error('Password is required');
+  }
+
+  if (password.length < 6) {
+    throw new Error('Password must be at least 6 characters');
+  }
+
+  if (!/[A-Z]/.test(password)) {
+    throw new Error('Password must contain uppercase letter');
+  }
+
+  if (!/[0-9]/.test(password)) {
+    throw new Error('Password must contain a number');
+  }
+
+  if (!/[!@#$%^&*(),.?":{}|<>]/.test(password)) {
+    throw new Error('Password must contain a special character');
+  }
+};
+
+// REGISTER
+export const register = async (req, res) => {
+  const { name, email, password } = req.body;
+
+  try {
+    validatePassword(password);
+
+    const hash = await bcrypt.hash(password, 10);
+
+    const user = await User.create({
+      name,
+      email,
+      password: hash,
+      activationToken: uuidv4(),
+      isActive: false,
+    });
+
+    await sendActivationEmail(user);
+
+    res.json({ message: 'Check email' });
+  } catch (e) {
+    res.status(400).json({ message: e.message });
+  }
+};
+
+// ACTIVATE
+export const activate = async (req, res) => {
+  const { token } = req.params;
+
+  const user = await User.findOne({
+    where: { activationToken: token },
+  });
+
+  if (!user) {
+    return res.status(400).json({ message: 'Invalid link' });
+  }
+
+  user.isActive = true;
+  user.activationToken = null;
+
+  await user.save();
+
+  const accessToken = jwt.sign({ id: user.id }, process.env.JWT_SECRET, {
+    expiresIn: '15m',
+  });
+
+  res.json({
+    accessToken,
+    user: {
+      id: user.id,
+      email: user.email,
+      name: user.name,
+    },
+  });
+};
+
+// LOGIN
+export const login = async (req, res) => {
+  const { email, password } = req.body;
+
+  const user = await User.findOne({ where: { email } });
+
+  if (!user) {
+    return res.status(400).json({ message: 'Invalid credentials' });
+  }
+
+  if (!user.isActive) {
+    return res.status(403).json({ message: 'Activate email first' });
+  }
+
+  const ok = await bcrypt.compare(password, user.password);
+
+  if (!ok) {
+    return res.status(400).json({ message: 'Invalid credentials' });
+  }
+
+  const accessToken = jwt.sign({ id: user.id }, process.env.JWT_SECRET, {
+    expiresIn: '15m',
+  });
+
+  const refreshToken = jwt.sign(
+    { id: user.id },
+    process.env.JWT_REFRESH_SECRET,
+    { expiresIn: '7d' },
+  );
+
+  res.json({
+    accessToken,
+    refreshToken,
+    user: {
+      id: user.id,
+      name: user.name,
+      email: user.email,
+    },
+  });
+};
+
+// REFRESH
+export const refresh = async (req, res) => {
+  try {
+    const refreshToken = req.cookies.refreshToken;
+
+    if (!refreshToken) {
+      return res.status(401).json({ message: 'No refresh token' });
+    }
+
+    const data = jwt.verify(refreshToken, process.env.JWT_REFRESH_SECRET);
+
+    const accessToken = jwt.sign({ id: data.id }, process.env.JWT_SECRET, {
+      expiresIn: '15m',
+    });
+
+    res.json({ accessToken });
+  } catch (e) {
+    res.status(401).json({ message: 'Invalid refresh token' });
+  }
+};
+
+// LOGOUT
+export const logout = async (req, res) => {
+  res.clearCookie('refreshToken');
+
+  res.json({ message: 'Logged out' });
+};
+
+export const forgotPassword = async (req, res) => {
+  const { email } = req.body;
+
+  const user = await User.findOne({ where: { email } });
+
+  if (!user) {
+    return res.status(400).json({ message: 'User not found' });
+  }
+
+  user.resetToken = uuidv4();
+  await user.save();
+
+  console.log(`Reset: /reset-password/${user.resetToken}`);
+
+  res.json({ message: 'Email sent' });
+};
+
+export const resetPassword = async (req, res) => {
+  const { token, password, confirmPassword } = req.body;
+
+  if (password !== confirmPassword) {
+    return res.status(400).json({ message: 'Passwords do not match' });
+  }
+
+  const user = await User.findOne({ where: { resetToken: token } });
+
+  if (!user) {
+    return res.status(400).json({ message: 'Invalid token' });
+  }
+
+  user.password = await bcrypt.hash(password, 10);
+  user.resetToken = null;
+
+  await user.save();
+
+  res.json({ message: 'Password changed' });
+};
diff --git a/backend/src/controllers/userController.js b/backend/src/controllers/userController.js
new file mode 100644
index 00000000..125ee970
--- /dev/null
+++ b/backend/src/controllers/userController.js
@@ -0,0 +1,127 @@
+/* eslint-disable no-console */
+/* eslint-disable curly */
+import { User } from '../models/User.js';
+import bcrypt from 'bcrypt';
+
+export const getProfile = async (req, res) => {
+  if (!req.user?.id) {
+    return res.status(401).json({ message: 'Unauthorized' });
+  }
+
+  const user = await User.findByPk(req.user.id);
+
+  if (!user) {
+    return res.status(404).json({ message: 'User not found' });
+  }
+
+  res.json({
+    id: user.id,
+    name: user.name,
+    email: user.email,
+  });
+};
+
+export const updateName = async (req, res) => {
+  if (!req.user?.id) {
+    return res.status(401).json({ message: 'Unauthorized' });
+  }
+
+  if (!req.body.name) {
+    return res.status(400).json({ message: 'Name is required' });
+  }
+
+  const user = await User.findByPk(req.user.id);
+
+  if (!user) {
+    return res.status(404).json({ message: 'User not found' });
+  }
+
+  user.name = req.body.name;
+  await user.save();
+
+  res.json({
+    id: user.id,
+    name: user.name,
+    email: user.email,
+  });
+};
+
+export const changePassword = async (req, res) => {
+  const { oldPassword, newPassword, confirmPassword } = req.body;
+
+  if (!req.user?.id) {
+    return res.status(401).json({ message: 'Unauthorized' });
+  }
+
+  if (!oldPassword || !newPassword || !confirmPassword) {
+    return res.status(400).json({ message: 'Missing fields' });
+  }
+
+  if (newPassword !== confirmPassword) {
+    return res.status(400).json({ message: 'Passwords do not match' });
+  }
+
+  if (newPassword.length < 6) {
+    return res.status(400).json({ message: 'Password too short' });
+  }
+
+  const user = await User.findByPk(req.user.id);
+
+  if (!user) {
+    return res.status(404).json({ message: 'User not found' });
+  }
+
+  const ok = await bcrypt.compare(oldPassword, user.password);
+
+  if (!ok) {
+    return res.status(400).json({ message: 'Wrong password' });
+  }
+
+  user.password = await bcrypt.hash(newPassword, 10);
+  await user.save();
+
+  res.json({ message: 'Password changed successfully' });
+};
+
+export const changeEmail = async (req, res) => {
+  const { password, newEmail } = req.body;
+
+  if (!req.user?.id) {
+    return res.status(401).json({ message: 'Unauthorized' });
+  }
+
+  if (!password || !newEmail) {
+    return res.status(400).json({ message: 'Missing fields' });
+  }
+
+  const user = await User.findByPk(req.user.id);
+
+  if (!user) {
+    return res.status(404).json({ message: 'User not found' });
+  }
+
+  const ok = await bcrypt.compare(password, user.password);
+
+  if (!ok) {
+    return res.status(400).json({ message: 'Wrong password' });
+  }
+
+  if (newEmail === user.email) {
+    return res.status(400).json({ message: 'Email is the same' });
+  }
+
+  const existing = await User.findOne({ where: { email: newEmail } });
+
+  if (existing) {
+    return res.status(400).json({ message: 'Email already in use' });
+  }
+
+  const oldEmail = user.email;
+
+  user.email = newEmail;
+  await user.save();
+
+  console.log(`Email changed from ${oldEmail} to ${newEmail}`);
+
+  res.json({ message: 'Email updated' });
+};
diff --git a/backend/src/index.js b/backend/src/index.js
new file mode 100644
index 00000000..43a2a6b9
--- /dev/null
+++ b/backend/src/index.js
@@ -0,0 +1,49 @@
+/* eslint-disable no-console */
+import 'dotenv/config';
+import express from 'express';
+import cors from 'cors';
+
+import sequelize from './config/db.js';
+import { authRouter } from './routes/authRoute.js';
+import { userRouter } from './routes/userRoute.js';
+
+const PORT = process.env.PORT || 3005;
+
+const app = express();
+
+app.use(express.json());
+
+app.use(
+  cors({
+    origin: process.env.CLIENT_HOST,
+    credentials: true,
+  }),
+);
+
+app.use('/auth', authRouter);
+app.use('/users', userRouter);
+
+app.get('/', (req, res) => {
+  res.send('Hello');
+});
+
+const startServer = async () => {
+  try {
+    await sequelize.authenticate();
+    console.log('DB connected');
+
+    await sequelize.sync({ alter: true });
+
+    app.listen(PORT, () => {
+      console.log(`Server running on port ${PORT}`);
+    });
+  } catch (err) {
+    console.error('DB error:', err);
+  }
+};
+
+app.use((req, res) => {
+  res.status(404).json({ message: 'Not found' });
+});
+
+startServer();
diff --git a/backend/src/middlewares/authMiddleware.js b/backend/src/middlewares/authMiddleware.js
new file mode 100644
index 00000000..f35758a1
--- /dev/null
+++ b/backend/src/middlewares/authMiddleware.js
@@ -0,0 +1,18 @@
+/* eslint-disable padding-line-between-statements */
+import jwt from 'jsonwebtoken';
+
+export const authMiddleware = (req, res, next) => {
+  const token = req.headers.authorization?.split(' ')[1];
+
+  if (!token) {
+    return res.sendStatus(401);
+  }
+
+  try {
+    const data = jwt.verify(token, process.env.JWT_SECRET);
+    req.user = data;
+    next();
+  } catch {
+    res.sendStatus(401);
+  }
+};
diff --git a/backend/src/models/User.js b/backend/src/models/User.js
new file mode 100644
index 00000000..05063dff
--- /dev/null
+++ b/backend/src/models/User.js
@@ -0,0 +1,26 @@
+import { DataTypes } from 'sequelize';
+import sequelize from '../config/db.js';
+import { v4 as uuidv4 } from 'uuid';
+
+export const User = sequelize.define('User', {
+  name: DataTypes.STRING,
+
+  email: {
+    type: DataTypes.STRING,
+    unique: true,
+  },
+
+  password: DataTypes.STRING,
+
+  isActive: {
+    type: DataTypes.BOOLEAN,
+    defaultValue: false,
+  },
+
+  activationToken: {
+    type: DataTypes.STRING,
+    defaultValue: uuidv4,
+  },
+
+  resetToken: DataTypes.STRING,
+});
diff --git a/backend/src/routes/authRoute.js b/backend/src/routes/authRoute.js
new file mode 100644
index 00000000..2a32c550
--- /dev/null
+++ b/backend/src/routes/authRoute.js
@@ -0,0 +1,22 @@
+import { Router } from 'express';
+import {
+  register,
+  login,
+  activate,
+  refresh,
+  logout,
+  forgotPassword,
+  resetPassword,
+} from '../controllers/authController.js';
+
+const router = Router();
+
+router.post('/register', register);
+router.post('/login', login);
+router.get('/activate/:token', activate);
+router.get('/refresh', refresh);
+router.post('/logout', logout);
+router.post('/forgot-password', forgotPassword);
+router.post('/reset-password', resetPassword);
+
+export const authRouter = router;
diff --git a/backend/src/routes/userRoute.js b/backend/src/routes/userRoute.js
new file mode 100644
index 00000000..d8314ea9
--- /dev/null
+++ b/backend/src/routes/userRoute.js
@@ -0,0 +1,17 @@
+import { Router } from 'express';
+import { authMiddleware } from '../middlewares/authMiddleware.js';
+import {
+  getProfile,
+  updateName,
+  changePassword,
+  changeEmail,
+} from '../controllers/userController.js';
+
+const router = Router();
+
+router.get('/profile', authMiddleware, getProfile);
+router.patch('/profile', authMiddleware, updateName);
+router.patch('/password', authMiddleware, changePassword);
+router.patch('/email', authMiddleware, changeEmail);
+
+export const userRouter = router;
diff --git a/backend/src/services/authService.js b/backend/src/services/authService.js
new file mode 100644
index 00000000..25e37f93
--- /dev/null
+++ b/backend/src/services/authService.js
@@ -0,0 +1,43 @@
+import bcrypt from 'bcrypt';
+import jwt from 'jsonwebtoken';
+import { User } from '../models/User.js';
+
+const generateTokens = (user) => {
+  const access = jwt.sign({ id: user.id }, process.env.JWT_SECRET, {
+    expiresIn: '15m',
+  });
+
+  return { access };
+};
+
+export const register = async (email, password, name) => {
+  const hash = await bcrypt.hash(password, 10);
+
+  const user = await User.create({
+    email,
+    password: hash,
+    name,
+  });
+
+  return user;
+};
+
+export const login = async (email, password) => {
+  const user = await User.findOne({ where: { email } });
+
+  if (!user) {
+    throw new Error('Invalid credentials');
+  }
+
+  const isMatch = await bcrypt.compare(password, user.password);
+
+  if (!isMatch) {
+    throw new Error('Invalid credentials');
+  }
+
+  if (!user.isActive) {
+    throw new Error('Please activate your email');
+  }
+
+  return generateTokens(user);
+};
diff --git a/backend/src/services/emailService.js b/backend/src/services/emailService.js
new file mode 100644
index 00000000..034066bc
--- /dev/null
+++ b/backend/src/services/emailService.js
@@ -0,0 +1,48 @@
+/* eslint-disable no-console */
+import nodemailer from 'nodemailer';
+
+const transporter = nodemailer.createTransport({
+  host: process.env.SMTP_HOST,
+  port: Number(process.env.SMTP_PORT),
+  secure: true,
+  auth: {
+    user: process.env.SMTP_USER,
+    pass: process.env.SMTP_PASSWORD,
+  },
+});
+
+export const sendActivationEmail = async (user) => {
+  const link = `http://localhost:5173/activate/${user.activationToken}`;
+
+  try {
+    await transporter.sendMail({
+      to: user.email,
+      subject: 'Activate account',
+      html: `<a href="${link}">Activate</a>`,
+    });
+
+    console.log('Activation email sent');
+  } catch (err) {
+    console.error('EMAIL ERROR:', err);
+  }
+};
+
+export const sendResetEmail = async (user) => {
+  const link = `http://localhost:5173/reset-password/${user.resetToken}`;
+
+  try {
+    await transporter.sendMail({
+      to: user.email,
+      subject: 'Reset password',
+      html: `
+        <h2>Password reset</h2>
+        <p>Click the link below to reset your password:</p>
+        <a href="${link}">${link}</a>
+      `,
+    });
+
+    console.log('Reset email sent');
+  } catch (err) {
+    console.error('RESET EMAIL ERROR:', err);
+  }
+};