I will fix bugs and errors in your react, next js or node js app

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jonas_filho_dev
J
jonas_filho_dev
Jonas Filho
fix bugs and errors in your react, next js or node js app
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fix bugs and errors in your react, next js or node js app

About this gig

Your app throws an error, a layout breaks on mobile, or a form silently stops sending. You need it found and fixed, not rewritten.


Send the error message, the repository or a link to the page. I reproduce the problem, find the cause and fix it with the smallest change that solves it. I do not refactor your codebase unless you ask for it.


I work with:

- React and Next.js: hooks, state, routing, hydration and build errors

- Node.js and Express: API errors, middleware, database queries

- CSS and responsive layout, including mobile-only problems

- Deployment: Vercel, Netlify and Linux servers with nginx


You get the corrected code, a short explanation of what was wrong, and a note on how to avoid it next time.


Message me with the error before ordering, so I confirm it fits the package you choose.

Get to know Jonas Filho

Jonas Filho

Full Stack Developer for React Node js and AI Agents

  • FromBrazil
  • Member sinceSep 2026

  • Languages

    Portuguese
Full stack developer working under my own brand, JF Dev. I build web applications with JavaScript, React and Node.js, and I run the infrastructure behind them: Linux servers, nginx, DNS, deployment and monitoring. The AI agents I ship are not demos. They talk to real users, call APIs, keep state and run on a schedule. I answer every message myself, usually within a few hours. Tell me what you need and I will tell you honestly whether I can deliver it, and when.

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