Next.js/Supabase Engineer Needed for Pre-Beta Security & Production Readiness Audit

I built a working SaaS app primarily through AI/vibe coding and I'm preparing to launch a small closed beta (10–25 users). I'm looking for an experienced senior developer to do a final launch-readiness audit. This is NOT a development job. Please don't build or rewrite anything. I want you to inspect the finished app and find things that I or the AI may have missed, especially security, privacy, authentication, database/RLS, Stripe, API abuse/cost risks, deployment, reliability, and other unknown issues. Stack: Next.js, TypeScript, Supabase/PostgreSQL, Stripe, Railway, external AI APIs. I've already done extensive automated testing and internal audits. I'm specifically looking for experienced human judgment and unknown unknowns. Deliverable: a short list of findings ranked: P0: Must fix before beta P1: Should fix before beta P2: Fine for beta Final question I want answered: “Would you be comfortable letting 10–25 real users use this app?” Budget: up to $200.