Muhammad H.

I build and improve Next.js + Supabase SaaS applications—from MVP development to fixing authentication, payments, database access, and production issues. Top Rated | 100% Job Success | $30K+ earned on Upwork I'm Muhammad Hamza, a full-stack developer with 5+ years of experience. I help founders and product teams launch new features and maintain existing applications, with a focus on secure backend workflows and practical, usable interfaces. RELEVANT CLIENT WORK • GoShopBlack: Developed and maintained marketplace APIs, seller/admin/customer workflows, Supabase database logic, Stripe Connect integrations, and production deployments. • Smiley's / W&T Digital GmbH: Worked on a franchise management platform's migration to Supabase, including authentication, role-based permissions, Row-Level Security, Edge Functions, and marketing approval workflows. • AI SaaS applications: Delivered updates, fixes, and maintenance across multiple completed Upwork contracts with 5-star client feedback. HOW I CAN HELP • Build or extend a SaaS MVP with Next.js, React, and TypeScript. • Implement Supabase authentication, PostgreSQL schemas, RLS policies, and backend functions. • Integrate Stripe subscriptions, marketplace payments, and third-party APIs. • Diagnose application bugs, resolve Vercel deployment issues, and improve existing codebases. • Add AI-powered features and workflows to an existing product. CLIENT FEEDBACK "Super fast turnaround! Resolved my Vercel/Next.js issue within minutes. Will definitely hire again for future tech support." — Upwork client, Vercel (Next.js) Deployment Maintenance Support Core stack: Next.js, Supabase, React, TypeScript, Node.js, PostgreSQL, Stripe, Tailwind CSS, and Vercel. Send me a message with your current stack, the feature or issue you need help with, and your target timeline. I'll help you identify a practical next step.