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zlabdev

Muhammad Zubair

@zlabdev

Full Stack Developer Fixing and Securing AI Generated Apps

Pakistan
English
About me
4+ years shipping full-stack apps. CEH-certified. I fix, secure, and complete AI-generated apps built with Lovable, Bolt, Replit, v0, Base44. 10+ production projects delivered live SaaS with real paying users, AI platforms with 100+ active users, payments at a Dubai fintech. Most vibe-coded MVPs ship with broken auth, missing backend, exposed API keys. I clean that up. Stack: Node.js, Express, Spring Boot, React, Next.js, Stripe, JWT/OAuth2, Supabase, Firebase. Send me your project link I'll tell you honestly what needs fixing.... Read more

Skills

z
zlabdev
Muhammad Zubair
Offline • 
Average response time: 6 hours

See my services

Troubleshooting & Improvements
I will fix and complete your ai generated app built with lovable, bolt, replit or v0
From$25 / projectMore details
Deployments & DevOps
I will add a real backend to your lovable, bolt, or replit app
From$60 / projectMore details

Portfolio

Work experience

Full-Stack Developer

Vault99 • Full-time

Jan 2023 - Present • 3 yrs 7 mos

Full-Stack Developer at VaultsPay (Dubai-based fintech payment platform). Built payment infrastructure and merchant tools using MERN stack. Key work: - Designed and implemented REST APIs for payment processing and merchant onboarding using Node.js, Express, MongoDB - Built JWT-based authentication and role-based access control - Set up CI/CD pipelines with Docker for automated deployment - Integrated third-party payment gateways and webhooks - Collaborated with backend, security, and product teams on production releases Tech stack: Node.js, Express.js, MongoDB, React, JWT, Docker, CI/CD, REST APIs

CODE

Backend Team Lead

CODE • Part-time

Feb 2025 - Feb 2026 • 1 yr

Backend Team Lead at CodeCrafters — led a team of 5 backend developers building a SaaS platform. Key achievements: - Led architecture decisions, code reviews, and delivery timelines for a 5-person backend team - Improved API response time by 30% through query optimization and caching layer - Built RESTful APIs with Node.js and Express, integrating MongoDB for data persistence - Set up CI/CD pipelines using Docker and GitHub Actions for seamless deployments - Mentored junior developers on backend best practices, code quality, and system design - Handled sprint planning and technical scoping for client-facing features Tech stack: Node.js, Express.js, MongoDB, Docker, GitHub Actions, REST APIs