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Supabase expert, full-stack AI app developer, and SaaS MVP builder for founders, startups, and agencies. If your Lovable, Bolt AI, Replit, Base44, Cursor, v0, or Windsurf app is broken, stuck, crashing, or showing a white screen I fix it fast. I also build SaaS products from scratch with authentication, subscriptions, and Stripe payments wired in correctly from day one. AI app builder rescue & bug fixing: Lovable bug fix, Lovable white screen fix, Lovable stuck build, Lovable expert, Lovable developer, Lovable platform troubleshooting, Bolt AI bug fix, Bolt AI developer, Bolt AI errors, Replit bug fix, Replit developer, Replit deployment issues, Base44 crash fix, Base44 developer, Base44 errors, Cursor AI developer, Cursor bug fix, v0 developer, v0 by Vercel fixes, Windsurf developer, Claude Code developer, Claude Code expert, Claude Code MCP setup, vibe coding fix, vibe coding errors, vibe coding cleanup, AI generated code cleanup, no-code to code migration, AI code rescue, broken AI app fix, half-built app completion, abandoned project rescue. Supabase & backend expertise: Supabase expert, Supabase developer, Supabase Auth, Supabase Auth bugs, Supabase Row Level Security, Supabase RLS policies, RLS misconfiguration fix, Supabase Edge Functions, Supabase Realtime, Supabase Storage, Supabase database errors, Supabase migration, PostgreSQL developer, PostgreSQL optimization, database schema design, database error fix, backend developer, backend architecture, API developer, REST API integration, webhook integration, webhook failures fix. Authentication & security: Authentication bugs, auth flow errors, login bugs, signup errors, session errors, OAuth integration, OAuth bugs, password reset fix, JWT errors, session token issues, security audit, exposed API key fix, secrets management, RLS security fix. Payments & subscriptions: Stripe integration, Stripe expert, Stripe developer, Stripe webhooks, Stripe webhook errors, Stripe subscription setup, subscription billing, recurring billing integration, SaaS billing developer, Stripe Connect, Stripe Checkout, payment integration, payment gateway developer, failed payment fix, checkout errors, subscription not activating fix. Frontend & full stack: React developer, React JS expert, Next JS developer, Next JS expert, Tailwind CSS developer, TypeScript developer, JavaScript developer, MERN stack developer, MongoDB developer, Node JS developer, Express JS developer, full-stack developer, full-stack AI developer, frontend developer, UI bug fix, responsive design fix. AI & automation: AI SaaS developer, AI MVP developer, OpenAI API integration, Anthropic Claude API, Claude API developer, RAG pipeline developer, AI agent developer, multi agent AI systems, AI chatbot developer, n8n automation, Zapier integration, Make automation platform, workflow automation developer, MCP server setup, Model Context Protocol developer. Deployment & DevOps: Vercel deployment, Vercel developer, Vercel build errors, Firebase developer, Firebase deployment, Netlify deployment, deployment issues fix, environment variable errors, DNS setup, domain configuration, CI/CD setup, production deployment expert. What I actually do for you: Send me your broken build and I'll tell you honestly what's wrong auth flow errors, RLS policies silently blocking real users, missing Stripe webhook signature verification, Next JS API routes leaking secrets, Vercel deployments failing from missing environment variables, Supabase JWT expiration bugs, or plain messy AI-generated code that needs a cleanup pass. I explain it in plain English before I touch anything, then fix it properly, not just patch the symptom. I also build SaaS MVPs from zero: idea to working product with real authentication, correctly scoped database permissions, working Stripe subscriptions, and a live Vercel or Firebase deployment. No shortcuts, no RLS disabled to make it work, no demo-only builds. Startup MVP developer, SaaS MVP developer, MVP development, SaaS application developer, client portal developer, dashboard developer, admin panel developer, internal tools developer, indie hacker developer, founder-friendly developer, non-technical founder support, production-ready app developer, scalable SaaS architecture, app modernization, legacy code refactor, code audit, technical co-founder for hire. Got a broken build or a brand-new idea? Send the details and I'll walk you through exactly what it needs to go live.

Most backend projects stall because of poorly designed APIs, slow database queries, or integrations that keep breaking. I fix and build exactly that — using Node.js, Express, NestJS, and Java, with enough React experience to make sure what I build actually works end-to-end. Why hire me? ⭐Deep Backend Expertise: I specialize in server-side logic, database design (SQL & NoSQL), and RESTful/GraphQL API development. ⭐ Performance Obsessed: At Scandiweb, I didn't just build features; I optimized performance, reducing load times by 35% and directly impacting conversion rates. I understand how backend latency kills user experience. ⭐ Frontend-Aware Architecture: Because I have experience with React and Next.js, I build APIs that are developer-friendly, well-documented, and easy for your frontend team to consume. ⭐ Reliability: I use TypeScript and Jest to ensure type safety and test coverage, meaning fewer bugs in production and easier scaling. Technical Stack: Languages: TypeScript, JavaScript (ES6+), Node.js. Frameworks: NestJS, Express.js. SpringBoot Databases: MongoDB, PostgreSQL, MySQL. Tools & DevOps: Docker, Git, Jest (Testing), Webpack. Integrations: Stripe (Payments), JWT/OAuth (Security), REST APIs, GraphQL. Backend: - Node.js, Express.js, Nest.js, Java, SpringBoot - MongoDB, PostgreSQL, MySQL - REST APIs, GraphQL - JWT, OAuth authentication - Stripe, PayPal payments, Paystack - Docker containerization, CI/CD Frontend: - React.js, Next.js, Tanstack Start - TypeScript, JavaScript (ES6+) - TailwindCSS, SCSS, Chakra UI - Redux, React Query (TanStack Query), Zustand - Responsive design, mobile-first approach Tools & Testing: - Git/GitHub, Vite, Webpack - Jest testing - Figma/XD to code conversion 💼Key Projects: - Chowmart (Food Delivery API): Architected a scalable backend with MongoDB and Express. Implemented complex order management logic and secure Stripe payment integration. - Chillax (Booking System): Built a secure booking platform using JWT authentication and RESTful APIs, optimized for high concurrency. I communicate clearly, hit deadlines, and prefer "boring," reliable code over over-engineered complexity. If you need a backend developer who can hit the ground running and deliver production-ready APIs, let's talk.

Need a backend that stays up when real users arrive, not just one that works in a demo? I'm a backend engineer working in Node.js, NestJS and TypeScript. I build and fix the APIs, databases and infrastructure behind SaaS, fintech and e-commerce products. My strength is production work: finding why a live system is failing and fixing the root cause. PRODUCTION PROBLEMS I'VE SOLVED → Redis connection exhaustion caused by singleton pattern violations in a NestJS service → PostgreSQL connection pool exhaustion with PgBouncer in a Docker + Prisma stack → 502 errors on Railway deployments, traced and resolved → OAuth 2.0 / PKCE authentication flows and role-based access control WHAT I CAN DO FOR YOU ✔ REST & GraphQL API development (NestJS, Express) ✔ Database design & query optimization (PostgreSQL, Prisma, MongoDB) ✔ Caching & performance (Redis, connection pooling) ✔ Authentication & authorization (JWT, OAuth, RBAC) ✔ Docker, CI/CD and deployment (Railway, cloud VPS) ✔ Third-party API, webhook and payment integrations ✔ Bug fixing and cleanup of existing Node.js codebases I CAN ALSO HELP YOU WITH ✔ Slow APIs and database queries: indexing, caching and query tuning ✔ Background jobs and queues HOW I WORK I get to know your codebase before I change it. I write clean, typed, testable code and document my APIs so your frontend team can integrate easily. You'll get clear updates on progress, blockers and risks. STACK Node.js · NestJS · TypeScript · Express · PostgreSQL · Prisma · Redis · MongoDB · Docker · REST · GraphQL · Git Have a backend to build, fix or scale? Send me a message with your stack and the problem, and I'll reply with how I'd approach it.

"Had a great experience with Hafiz. Discussed the art of the possible and quickly got to work. Clear comms throughout and quick turnaround times. Knowledgeable in JS, React, MongoDB etc. and was able to spin up a web app very quickly which calls a third party API as requested." - CMO, EcomAccountants. Hi there. Are you looking for a seasoned and experienced full-stack engineer to take charge of your web infrastructure? Search no further! With over five (5) years of hands-on experience in web development across various industries, I am well-prepared to build and manage your entire project with speed and scalability in mind. Why work with me: ✔ Full Stack Expertise: I am well-versed in both front-end and back-end development, enabling me to handle all aspects of your project seamlessly. ✔ Pixel-Perfect Design: Your user interface will be flawlessly implemented, ensuring a smooth and visually appealing user experience. ✔ Robust Databases & APIs: I specialise in designing and deploying various database systems and constructing powerful REST APIs. ✔ Integration & Deployment: Seamlessly integrating front-end UI with the APIs and setting up continuous integration and deployment for efficient workflows. My Skills & Tools: ✔ Modern Web Technologies: Proficient in writing HTML, CSS, and JavaScript using the latest practices (HTML5, CSS3, and ECMAScript 6 and beyond). ✔ Back-End Proficiency: Expert in PHP, Python, and NodeJS, allowing me to handle complex server-side operations. ✔ Database Design & Management: I stay up-to-date with the latest practices and versions, ensuring optimise database solutions. ✔ Framework Proficiency: I am skilled in working with top-notch frameworks like Express, Laravel, NextJs and. ✔ Code Quality & Documentation: I prioritise clean, well-documented code, making maintenance and future enhancements seemingly easy. What I Offer: By working with me, you can expect a seamless development process, on-time project delivery, and the assurance of top-notch quality. Whether you have a specific set of requirements or need guidance in shaping your project, I am here to assist you at every step. Let's Get Started: Share your project requirements with me, and I'll take care of the rest. My commitment to excellence ensures that you'll not only get exceptional results but also enjoy a smooth and engaging development experience. Looking forward to hearing from you and working together to bring your vision to life. Regards Hafizferanmi.