You will get a real backend added to your Lovable, Bolt, or Replit app
Project details
Vibe-coded apps from Lovable, Bolt, or Replit often look finished on the surface but have little to no real backend — no proper database structure, no authentication, no server-side logic. That's fine for a demo. It's not fine for real users.
I build the backend your app actually needs: a real database (Supabase, Firebase, PostgreSQL, or MongoDB), proper user authentication (JWT or OAuth2), and clean API endpoints connecting it all to your existing frontend — without breaking what already works.
Background: Node.js/Express, Spring Boot/Java, PostgreSQL/MongoDB, JWT & OAuth2 authentication — shipped in production at VaultsPay Dubai (fintech), not just tutorial projects.
What you get:
→ Database setup and connection (Supabase, Firebase, or custom)
→ User authentication (JWT / OAuth2) with secure session handling
→ REST API endpoints for your app's core functionality
→ Frontend fully wired to the new backend
→ Environment setup and deployment guidance
Send me your project link and tell me what your app is supposed to do — I'll map out exactly what backend work it needs before you commit to anything.
I build the backend your app actually needs: a real database (Supabase, Firebase, PostgreSQL, or MongoDB), proper user authentication (JWT or OAuth2), and clean API endpoints connecting it all to your existing frontend — without breaking what already works.
Background: Node.js/Express, Spring Boot/Java, PostgreSQL/MongoDB, JWT & OAuth2 authentication — shipped in production at VaultsPay Dubai (fintech), not just tutorial projects.
What you get:
→ Database setup and connection (Supabase, Firebase, or custom)
→ User authentication (JWT / OAuth2) with secure session handling
→ REST API endpoints for your app's core functionality
→ Frontend fully wired to the new backend
→ Environment setup and deployment guidance
Send me your project link and tell me what your app is supposed to do — I'll map out exactly what backend work it needs before you commit to anything.
Programming Languages
JavaScript, Python, JavaCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$120
|
Standard
$300
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 2 | 3 | 4 |
Design Customization | |||
Content Upload | - | ||
Responsive Design | |||
Source Code | - | - |
Frequently asked questions
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MB
Muhammad B.
Jan 23, 2026
Expert Backend Developer for AI SaaS Bug Fix
Quickly identified the issue and fixed the backend bug with clean, efficient code, great AI SaaS expertise.
About Zubair
Lovable, Bolt & Replit App Fixes | Supabase, Stripe, Security Audit
Islamabad, Pakistan - 11:09 am local time
That gap between "it works in the demo" and "it survives real users" is what I fix.
I'm a full-stack developer (Node.js, Express, React/Next.js, Supabase, PostgreSQL) and a CEH-certified ethical hacker. Plenty of developers can add features to an AI-generated app. Fewer can look at that code and tell you which part will quietly leak your customers' data the week after launch. I do both.
WHAT I FIX
- Supabase Row Level Security: real tenant-to-tenant data isolation, not "RLS enabled" and hope for the best
- Broken authentication and sessions (Supabase Auth, JWT, OAuth, Auth0)
- Exposed API keys, secrets in the repo, service-role keys shipped to the browser
- Stripe and Lemon Squeezy billing: checkout, webhooks, idempotency, failed payments, plan gating
- Uncapped AI/LLM endpoints that let anyone run up your OpenAI or Claude bill
- Input validation, SQL injection, rate limiting, error handling
- Real backends added to frontend-only vibe-coded apps: schema design, APIs, migrations
- Deployments that hold: env vars, custom domains, CI/CD, Vercel, Docker, AWS
HOW I WORK
1. Send me your app link or repo. I take a look and tell you honestly what's wrong. No charge, no pitch.
2. You get findings ranked by severity, in plain English. "Any signed-in user can read every other customer's records", not a wall of CVE numbers.
3. We agree a fixed price per fix. Work is delivered as pull requests you review and approve. Your code stays yours throughout.
PROOF
- Shipped an AI study app, live on Google Play with 100+ users
- Built and deployed a RAG document Q&A chatbot for a SaaS client
- Production fintech work at VaultsPay: JWT auth, secure APIs, CI/CD pipelines
- Backend team lead on a 5-developer SaaS build (Node.js, React, MongoDB)
- CEH (Certified Ethical Hacker), EC-Council, 2025
- 5.0 on Upwork: hired to fix an AI SaaS backend bug, diagnosed and shipped inside 24 hours
WAYS TO START
- Free 15-minute review of your app before you spend anything
- Fixed-price security audit with a written, severity-ranked report
- Fixed-price rescue: auth, backend, payments and deployment sorted so you can launch
- Hourly or monthly retainer once you're live and want someone on call
Send me your app link and tell me what's breaking. If it isn't something I can genuinely help with, I'll tell you that too.
Keywords: Lovable developer, Lovable app fix, Bolt.new developer, Replit developer, Base44, v0, Cursor, vibe coding, vibe code rescue, AI app production ready, MVP rescue, Supabase RLS, Supabase auth, Supabase edge functions, PostgreSQL, Stripe integration, Stripe webhooks, Lemon Squeezy, Next.js, React, TypeScript, Node.js, Express, security audit, code review, bug fix, API development, full-stack developer.
Steps for completing your project
After purchasing the project, send requirements so Zubair can start the project.
Delivery time starts when Zubair receives requirements from you.
Zubair works on your project following the steps below.
Revisions may occur after the delivery date.
Scope and architecture
I review your frontend and your app's intended functionality, then design the backend architecture — database schema, auth flow, and API endpoints — and confirm with you before writing any code.
Set up database and authentication
I set up your chosen database (Supabase, Firebase, PostgreSQL, or MongoDB) with proper schema and add real authentication (JWT or OAuth2) with secure session handling.