Looking for Full Stack Developer — Audit & Complete Existing Next.js / Supabase / Python / AI Project

I have an existing web platform that was partially built by a previous contractor, and I need an experienced full stack developer to independently review the work and help me complete the project.
About the project:
A web platform that collects user data through an intake form, processes it through a custom calculation engine, and uses AI to generate a personalized report that is automatically delivered to the user.
Tech stack:

Next.js (frontend)
Supabase (database, auth, backend)
Python (calculation engine)
Stripe (payments)
AI API integration — report generation
Vercel (hosting)...Budget negotiable.