diff --git a/cypress/e2e/onboarding.cy.ts b/cypress/e2e/onboarding.cy.ts
index 6f1908c..d2aa75a 100644
--- a/cypress/e2e/onboarding.cy.ts
+++ b/cypress/e2e/onboarding.cy.ts
@@ -6,7 +6,8 @@ describe('Supplier Portal Onboarding & Feature E2E Flow', () => {
 
     // 2. Registration Page
     cy.contains('Get Started Today').click();
-    cy.get('input#reg-email').type('test_seller@example.com');
+    const randUser = `test_seller_${Date.now()}@example.com`;
+    cy.get('input#reg-email').type(randUser);
     cy.get('input#reg-phone').type('9876543210');
     cy.get('input#reg-pass').type('super_secure_pass_123');
     cy.get('input#reg-confirm-pass').type('super_secure_pass_123');
@@ -109,7 +110,8 @@ describe('Supplier Portal Onboarding & Feature E2E Flow', () => {
 
     // 2. Go to Registration
     cy.contains('Get Started Today').click();
-    cy.get('input#reg-email').type('security_test@example.com');
+    const randSecurityUser = `security_test_${Date.now()}@example.com`;
+    cy.get('input#reg-email').type(randSecurityUser);
     cy.get('input#reg-phone').type('9000000000');
     cy.get('input#reg-pass').type('password123');
     cy.get('input#reg-confirm-pass').type('password123');
diff --git a/src/App.test.tsx b/src/App.test.tsx
index 0ab93a2..2bf68a7 100644
--- a/src/App.test.tsx
+++ b/src/App.test.tsx
@@ -2,9 +2,27 @@ import { render, screen, fireEvent } from '@testing-library/react'
 import { describe, it, expect, vi, beforeAll } from 'vitest'
 import App from './App'
 
-// Mock window.scrollTo since jsdom does not implement it
+// Mock window.scrollTo and fetch since jsdom does not implement them
 beforeAll(() => {
   window.scrollTo = vi.fn()
+  global.fetch = vi.fn((url) => {
+    let responseData: any = {};
+    if (url.includes('/api/auth/register') || url.includes('/api/auth/login')) {
+      responseData = { id: 1, username: 'test_seller', email: 'test@example.com' };
+    } else if (url.includes('/api/products')) {
+      responseData = [];
+    } else if (url.includes('/api/orders')) {
+      responseData = [];
+    } else if (url.includes('/api/returns')) {
+      responseData = [];
+    } else if (url.includes('/api/wallet')) {
+      responseData = { outstanding: 850.00, withdrawn: 1250.00, transactions: [] };
+    }
+    return Promise.resolve({
+      ok: true,
+      json: () => Promise.resolve(responseData)
+    } as Response);
+  })
 })
 
 describe('Supplier Portal Onboarding & Active Dashboard Tests', () => {
@@ -64,7 +82,7 @@ describe('Supplier Portal Onboarding & Active Dashboard Tests', () => {
     fireEvent.click(registerBtn)
     
     // Step 1: Contact Verification
-    expect(screen.getByText(/Step 1 of 3: Contact Verification/i)).toBeInTheDocument()
+    expect(await screen.findByText(/Step 1 of 3: Contact Verification/i)).toBeInTheDocument()
     
     const sendWhatsappBtn = screen.getByText(/Send WhatsApp OTP/i)
     fireEvent.click(sendWhatsappBtn)
@@ -151,7 +169,7 @@ describe('Supplier Portal Onboarding & Active Dashboard Tests', () => {
     alertMock.mockRestore()
   })
 
-  it('logs in successfully and navigates dashboard tools', () => {
+  it('logs in successfully and navigates dashboard tools', async () => {
     render(<App />)
     
     const loginBtn = screen.getByRole('button', { name: /^Login$/i })
@@ -167,7 +185,7 @@ describe('Supplier Portal Onboarding & Active Dashboard Tests', () => {
     fireEvent.click(submitBtn)
     
     // Check dashboard rendering
-    expect(screen.getByText('Performance Analytics')).toBeInTheDocument()
+    expect(await screen.findByText('Performance Analytics')).toBeInTheDocument()
     
     // Check Sidebar Tab click: Manage Products
     const productsTabBtn = screen.getByText(/Manage Products/i)
diff --git a/src/App.tsx b/src/App.tsx
index dba3702..e864612 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -269,7 +269,34 @@ export default function App() {
       return;
     }
 
-    navigateTo('profile-completion')
+    fetch(`${CONFIG.apiBaseUrl}/api/auth/register/`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        username: email,
+        email: email,
+        phone: phone,
+        password: password
+      })
+    })
+    .then(res => {
+      if (!res.ok) throw new Error('Registration failed. Username/email might already be taken.');
+      return res.json();
+    })
+    .then(() => {
+      // Auto login after signup
+      fetch(`${CONFIG.apiBaseUrl}/api/auth/login/`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ username: email, password: password })
+      })
+      .then(() => {
+        navigateTo('profile-completion')
+      })
+    })
+    .catch(err => {
+      alert(err.message);
+    });
   }
 
   const handleLoginSubmit = (e: React.FormEvent) => {
@@ -282,8 +309,22 @@ export default function App() {
       return;
     }
 
-    setIsProfileComplete(true)
-    navigateTo('dashboard', true)
+    fetch(`${CONFIG.apiBaseUrl}/api/auth/login/`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ username: email, password: password })
+    })
+    .then(res => {
+      if (!res.ok) throw new Error('Invalid credentials.');
+      return res.json();
+    })
+    .then(() => {
+      setIsProfileComplete(true)
+      navigateTo('dashboard', true)
+    })
+    .catch(err => {
+      alert(err.message);
+    });
   }
 
   const handleProfileSubmit = (e: React.FormEvent) => {