Senior Full-Stack Developer to take over my AI-built SaaS (React + Supabase)

Over the last 4 months I built the MVP of my SaaS myself using Claude Code. It’s a booking and client-management tool for independent fitness coaches. Coaches can manage their schedule, take payments and send workout plans to clients. I’ve reached the point where every change I make with AI breaks something else, and I’m spending more time fixing than building. I need a senior developer to take over the codebase so I can focus on sales and customers. Current stack (as far as I understand it): React + Vite + Tailwind Supabase (database, auth, storage) Stripe for subscriptions Deployed on Vercel Some Supabase Edge Functions that I don’t fully understand Known problems: Users sometimes get logged out randomly Stripe webhooks occasionally don’t update the subscription status The calendar page is very slow with more than ~50 bookings No tests at all, and I’m not sure the database security rules (RLS?) are set up correctly The code is messy. Some files are 1,500+ lines What I need: Review the codebase and tell me honestly what state it’s in. Can we keep it or do we need to rewrite parts? Fix the critical bugs above Set up a proper workflow (Git branches, staging environment, tests) Keep building features long-term. The roadmap includes a mobile app, group classes and an AI workout generator About you: You’ve worked with AI-generated code before and won’t judge me for it 😅 You can explain technical things in simple words Available for at least a 2–3 hour overlap with Singapore time Bonus: you’ve built SaaS products with Stripe subscriptions To make sure you read this, start your proposal with the word “coach”. Screening questions: Have you taken over an AI-generated or messy codebase before? What did you do first? How would you approach the first 2 weeks? What is your availability per week?