Noah L.

I build and fix full-stack SaaS web applications in Next.js, Node.js, PostgreSQL and Supabase, from MVP to production-ready, with a focus on the parts that break once real users arrive: auth, payments and data. Many of my clients built fast with Lovable, Cursor, Bolt or Claude Code. The app works in the demo, then real users, real money and real data hit it. That's where I come in: code review, debugging and fixes that make the app secure, stable and scalable. What I do • Build: MVPs and new SaaS features end to end, from database design and REST APIs to the React front end • Secure: Supabase Row Level Security, auth and user roles, multi-tenant data separation, exposed API keys, open tables • Payments: Stripe and Paystack integration, subscriptions and webhooks that reconcile • Data: database architecture, slow queries, missing indexes, zero-downtime migrations • AI integration: adding AI features and multi-step AI workflows to real products, built to hold up in production • API integration: third-party APIs, webhooks and background jobs that don't fail silently • Performance: slow pages, slow APIs, and apps that need to scale under real traffic How I work For existing apps, I start with a fixed-price audit: a code review and security audit with a written list of risks ranked by severity, and the fix for each. Then I fix them in that order, or hand the list to your team. For new builds, I plan the software architecture first, then ship in small, tested milestones. No rewrite for the sake of it. What works stays. Proof • Debugged and fixed a critical failure in a 10-stage AI SaaS workflow, then audited the rest of the system so it could ship (Clarity Ops Method) • Built a two-sided escrow marketplace with a double-entry PostgreSQL ledger and idempotent Paystack webhooks (ZexusPro) • Migrated live production databases from MongoDB to PostgreSQL and MySQL to Supabase with zero downtime and zero data loss • Built and scaled OmniBingo, a real-time SaaS web app on Supabase and Stripe, across three phases • Built Lockjaw, a CLI that catches dangerous PostgreSQL migrations before they reach production Stack Next.js, React, TypeScript, JavaScript, Node.js, NestJS, Express, PostgreSQL, Supabase, MongoDB, Drizzle, Stripe, Paystack, REST APIs, Vercel Top Rated. 100% Job Success. Repeat clients. "He doesn't just build what you ask; he builds what you're actually trying to create." "One of the most complete and professional engagements I've experienced on Upwork." Tell me what you're building or what's breaking. I'll reply with what I'd do first and a fixed price for it.