diff --git a/backend/controllers/auth.controller.js b/backend/controllers/auth.controller.js
new file mode 100644
index 000000000..552055777
--- /dev/null
+++ b/backend/controllers/auth.controller.js
@@ -0,0 +1,102 @@
+// controllers/auth.controller.js
+const User = require('../models/User');
+const jwt = require('jsonwebtoken');
+
+// @desc    Register a new user
+// @route   POST /api/auth/register
+// @access  Public
+exports.register = async (req, res) => {
+  try {
+    const { name, email, password, role } = req.body;
+
+    // Basic validation
+    if (!name || !email || !password || !role) {
+      return res.status(400).json({ message: 'Please provide all required fields' });
+    }
+
+    // Check if user already exists
+    const existingUser = await User.findOne({ email });
+    if (existingUser) {
+      return res.status(400).json({ message: 'User already exists with this email' });
+    }
+
+    // Create new user (password will be hashed by the pre-save hook)
+    const user = await User.create({
+      name,
+      email,
+      password,
+      role,
+      profile: {} // initialize empty profile
+    });
+
+    // Generate JWT token (optional – you can also require login after registration)
+    const token = jwt.sign(
+      { id: user._id, role: user.role },
+      process.env.JWT_SECRET,
+      { expiresIn: '7d' }
+    );
+
+    // Return user info (excluding password) and token
+    res.status(201).json({
+      message: 'User registered successfully',
+      token,
+      user: {
+        id: user._id,
+        name: user.name,
+        email: user.email,
+        role: user.role,
+        profile: user.profile
+      }
+    });
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ message: 'Server error', error: error.message });
+  }
+};
+
+// @desc    Login user
+// @route   POST /api/auth/login
+// @access  Public
+exports.login = async (req, res) => {
+  try {
+    const { email, password } = req.body;
+
+    if (!email || !password) {
+      return res.status(400).json({ message: 'Please provide email and password' });
+    }
+
+    // Find user by email
+    const user = await User.findOne({ email });
+    if (!user) {
+      return res.status(401).json({ message: 'Invalid credentials' });
+    }
+
+    // Check password
+    const isMatch = await user.comparePassword(password);
+    if (!isMatch) {
+      return res.status(401).json({ message: 'Invalid credentials' });
+    }
+
+    // Generate token
+    const token = jwt.sign(
+      { id: user._id, role: user.role },
+      process.env.JWT_SECRET,
+      { expiresIn: '7d' }
+    );
+
+    res.json({
+      message: 'Login successful',
+      token,
+      user: {
+        id: user._id,
+        name: user.name,
+        email: user.email,
+        role: user.role,
+        profile: user.profile
+      }
+    });
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ message: 'Server error', error: error.message });
+  }
+};
\ No newline at end of file
diff --git a/backend/controllers/user.controller.js b/backend/controllers/user.controller.js
new file mode 100644
index 000000000..eda096f04
--- /dev/null
+++ b/backend/controllers/user.controller.js
@@ -0,0 +1,51 @@
+// controllers/user.controller.js
+const User = require('../models/User');
+
+// @desc    Get current user profile
+// @route   GET /api/users/profile
+// @access  Private
+exports.getProfile = async (req, res) => {
+  try {
+    const user = await User.findById(req.user.id).select('-password');
+    if (!user) {
+      return res.status(404).json({ message: 'User not found' });
+    }
+    res.json(user);
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ message: 'Server error' });
+  }
+};
+
+// @desc    Update current user profile
+// @route   PUT /api/users/profile
+// @access  Private
+exports.updateProfile = async (req, res) => {
+  try {
+    const { bio, company, investmentHistory, preferences } = req.body;
+
+    const user = await User.findById(req.user.id);
+    if (!user) {
+      return res.status(404).json({ message: 'User not found' });
+    }
+
+    // Update only fields that are sent in the request
+    if (bio !== undefined) user.profile.bio = bio;
+    if (company !== undefined) user.profile.company = company;
+    if (investmentHistory !== undefined) user.profile.investmentHistory = investmentHistory;
+    if (preferences) {
+      if (preferences.categories !== undefined) user.profile.preferences.categories = preferences.categories;
+      if (preferences.riskTolerance !== undefined) user.profile.preferences.riskTolerance = preferences.riskTolerance;
+    }
+
+    await user.save();
+
+    res.json({
+      message: 'Profile updated successfully',
+      profile: user.profile
+    });
+  } catch (error) {
+    console.error(error);
+    res.status(500).json({ message: 'Server error' });
+  }
+};
\ No newline at end of file
diff --git a/backend/middleware/auth.middleware.js b/backend/middleware/auth.middleware.js
new file mode 100644
index 000000000..786c25251
--- /dev/null
+++ b/backend/middleware/auth.middleware.js
@@ -0,0 +1,27 @@
+// middleware/auth.middleware.js
+const jwt = require('jsonwebtoken');
+
+module.exports = (req, res, next) => {
+  try {
+    // Get token from Authorization header
+    const authHeader = req.header('Authorization');
+    if (!authHeader || !authHeader.startsWith('Bearer ')) {
+      return res.status(401).json({ message: 'Access denied. No token provided.' });
+    }
+
+    const token = authHeader.replace('Bearer ', '');
+    const decoded = jwt.verify(token, process.env.JWT_SECRET);
+    
+    // Attach user info to request object
+    req.user = decoded; // { id, role, iat, exp }
+    next();
+  } catch (error) {
+    if (error.name === 'TokenExpiredError') {
+      return res.status(401).json({ message: 'Token expired' });
+    }
+    if (error.name === 'JsonWebTokenError') {
+      return res.status(401).json({ message: 'Invalid token' });
+    }
+    res.status(500).json({ message: 'Server error' });
+  }
+};
\ No newline at end of file
diff --git a/backend/middleware/role.middleware.js b/backend/middleware/role.middleware.js
new file mode 100644
index 000000000..d7058a2ba
--- /dev/null
+++ b/backend/middleware/role.middleware.js
@@ -0,0 +1,14 @@
+// middleware/role.middleware.js
+const roleMiddleware = (...allowedRoles) => {
+  return (req, res, next) => {
+    if (!req.user) {
+      return res.status(401).json({ message: 'Unauthorized - no user found' });
+    }
+    if (!allowedRoles.includes(req.user.role)) {
+      return res.status(403).json({ message: 'Forbidden - insufficient role' });
+    }
+    next();
+  };
+};
+
+module.exports = roleMiddleware;
\ No newline at end of file
diff --git a/backend/models/User.js b/backend/models/User.js
new file mode 100644
index 000000000..23ed99b07
--- /dev/null
+++ b/backend/models/User.js
@@ -0,0 +1,55 @@
+// models/User.js
+const mongoose = require('mongoose');
+const bcrypt = require('bcryptjs');
+
+const userSchema = new mongoose.Schema({
+  name: {
+    type: String,
+    required: true,
+    trim: true
+  },
+  email: {
+    type: String,
+    required: true,
+    unique: true,
+    lowercase: true,
+    trim: true
+  },
+  password: {
+    type: String,
+    required: true
+  },
+  role: {
+    type: String,
+    enum: ['investor', 'entrepreneur'],
+    required: true
+  },
+  profile: {
+    bio: { type: String, default: '' },
+    company: { type: String, default: '' },
+    investmentHistory: [{ type: String }], // or more complex structure
+    preferences: {
+      categories: [{ type: String }],
+      riskTolerance: { type: String, enum: ['low', 'medium', 'high'], default: 'medium' }
+    }
+  }
+}, { timestamps: true });
+
+// Hash password before saving
+userSchema.pre('save', async function(next) {
+  if (!this.isModified('password')) return next();
+  try {
+    const salt = await bcrypt.genSalt(10);
+    this.password = await bcrypt.hash(this.password, salt);
+    next();
+  } catch (err) {
+    next(err);
+  }
+});
+
+// Method to compare passwords (for login)
+userSchema.methods.comparePassword = async function(candidatePassword) {
+  return await bcrypt.compare(candidatePassword, this.password);
+};
+
+module.exports = mongoose.model('User', userSchema);
\ No newline at end of file
diff --git a/backend/package-lock.json b/backend/package-lock.json
new file mode 100644
index 000000000..9497061eb
--- /dev/null
+++ b/backend/package-lock.json
@@ -0,0 +1,1625 @@
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+  "lockfileVersion": 3,
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+  "packages": {
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+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-11.0.0.tgz",
+      "integrity": "sha512-RKT8HExMpoYx4igMiVMY83lN6UeITKJlBQ+vR/8ZJ8OCdSiN3RwCq+9gH0+Xzj0+5IrM6i4j/6LuvzbZIQgEcQ==",
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^3.0.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    }
+  }
+}
diff --git a/backend/package.json b/backend/package.json
new file mode 100644
index 000000000..317f1db64
--- /dev/null
+++ b/backend/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "type": "commonjs",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "nodemon server.js"
+  },
+  "dependencies": {
+    "bcryptjs": "^2.4.3",
+    "cors": "^2.8.5",
+    "dotenv": "^16.0.3",
+    "express": "^4.18.2",
+    "jsonwebtoken": "^9.0.0",
+    "mongoose": "^7.0.0"
+  },
+  "devDependencies": {
+    "nodemon": "^2.0.22"
+  }
+}
\ No newline at end of file
diff --git a/backend/routes/auth.routes.js b/backend/routes/auth.routes.js
new file mode 100644
index 000000000..3d4b61d20
--- /dev/null
+++ b/backend/routes/auth.routes.js
@@ -0,0 +1,9 @@
+// routes/auth.routes.js
+const express = require('express');
+const { register, login } = require('../controllers/auth.controller');
+const router = express.Router();
+
+router.post('/register', register);
+router.post('/login', login);
+
+module.exports = router;
\ No newline at end of file
diff --git a/backend/routes/user.routes.js b/backend/routes/user.routes.js
new file mode 100644
index 000000000..569bad5ec
--- /dev/null
+++ b/backend/routes/user.routes.js
@@ -0,0 +1,27 @@
+// routes/user.routes.js
+const express = require('express');
+const router = express.Router();
+const auth = require('../middleware/auth.middleware');
+const role = require('../middleware/role.middleware');
+const { getProfile, updateProfile } = require('../controllers/user.controller');
+
+// All routes below are protected by auth middleware
+router.get('/profile', auth, getProfile);
+router.put('/profile', auth, updateProfile);
+
+// Optional role-specific dashboards (you can uncomment these)
+router.get('/investor/dashboard', auth, role('investor'), (req, res) => {
+  res.json({ 
+    message: 'Welcome investor!', 
+    data: { stats: { investments: 5, portfolio: '$1.2M' } } 
+  });
+});
+
+router.get('/entrepreneur/dashboard', auth, role('entrepreneur'), (req, res) => {
+  res.json({ 
+    message: 'Welcome entrepreneur!', 
+    data: { stats: { startups: 2, funding: '$500K' } } 
+  });
+});
+
+module.exports = router;
\ No newline at end of file
diff --git a/backend/server.js b/backend/server.js
new file mode 100644
index 000000000..39c4c559b
--- /dev/null
+++ b/backend/server.js
@@ -0,0 +1,32 @@
+// server.js (or index.js)
+const express = require('express');
+const mongoose = require('mongoose');
+const cors = require('cors');
+require('dotenv').config();
+
+const authRoutes = require('./routes/auth.routes');
+const userRoutes = require('./routes/user.routes');   // <-- ADD THIS LINE
+
+const app = express();
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+
+// Routes
+app.use('/api/auth', authRoutes);
+app.use('/api/users', userRoutes);                    // <-- ADD THIS LINE
+
+// Test route
+app.get('/', (req, res) => {
+  res.send('Nexus Backend API');
+});
+
+// Connect to MongoDB
+mongoose.connect(process.env.MONGO_URI)
+  .then(() => {
+    console.log('Connected to MongoDB');
+    const PORT = process.env.PORT || 5000;
+    app.listen(PORT, () => console.log(`Server running on port ${PORT}`));
+  })
+  .catch(err => console.error('MongoDB connection error:', err));
\ No newline at end of file