I will fix bugs in your react, nextjs, supabase or lovable app

Please message me before ordering so I can look at the bug and confirm the right package.

Your app mostly works, but something is broken, and each time you ask the AI builder to fix it, something else changes. I can help with that.

I work in existing React, Next.js, Vite and Supabase codebases, including apps made with Lovable, Bolt or Replit. First I reproduce the bug so we both know exactly what is wrong. Then I find the root cause, fix it, and add a regression test so it doesn't come back quietly.

Common problems I handle:

- Dates shifting across timezones

- Floating-point money values

- Race conditions in search

- Duplicate submissions on double-click

- Stale data after an account switch

- Missing form validation

- Supabase RLS policies that expose data

You get a pull request, the tests, and a plain-English report of what was wrong and what changed.

I come from Japanese localization QA. I work with AI coding tools (Claude Code) and check every result with tests before I call anything done. We work in writing through Fiverr messages. I don't take calls, and you keep a written record of every decision.