Title: Pre-Launch Technical Audit — React/Supabase/Stripe Web App (Lovable-built)

I'm launching a paid online course platform in the next few days and I need an experienced developer to audit the site before launch. To be clear: I don't need you to build anything. I need you to review the app, stress-test the critical parts, and give me a prioritized report of anything that could break or fail under real traffic. About the project: The platform was built with Lovable (React front-end, Supabase back-end/database). It handles real payments through Stripe and Mercado Pago, user authentication, course progress tracking, a diploma/certificate system, and a downloadable-content section. We're expecting a significant traffic spike at launch (the course is tied to a public figure with a large audience). What I need you to check and report on: Payments — Confirm Stripe and Mercado Pago flows work end-to-end, including edge cases (user closes window mid-payment, payment succeeds but page doesn't reload, webhooks firing correctly, no double-charges). Data & security — Review database structure and permissions (Supabase RLS policies + grants). Confirm users can't access each other's data, admin sections are properly protected, and no sensitive data is exposed. Load capacity — Assess whether the current setup can handle a large number of concurrent users at launch (traffic spike). Flag any bottlenecks. Auth & access — Test login, signup, session handling, and access control (paid vs. unpaid users). General QA — Mobile responsiveness, broken links, console errors, and overall stability. Deliverable: A prioritized written report — clearly separated into: 🔴 Critical (must fix before launch — anything that risks payments, data, or the site going down) 🟡 Minor (should fix, but not blocking) For each item, a short explanation of the problem and a suggested fix. Required experience: Strong experience with React, Supabase, and Stripe (Mercado Pago a big plus) Familiarity with Lovable is a strong plus Experience auditing/QA-ing web apps before launch Able to work quickly (I need this within a few days) Please include in your proposal: A brief note on your experience with this exact stack (React/Supabase/Stripe). How you'd approach a pre-launch audit like this. Your estimated timeline. Note on access: I'll provide temporary, controlled access to the project for the review. Please mention how you typically handle secure access to a client's environment.