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$
USD
I will fix bugs in your react, javascript or firebase app
Emma Tong
About this gig
Got a bug in your React, Vite or Firebase app? I'll find it and fix it fast.
I build and maintain a full production app on this exact stack (React + Firebase: Firestore, Cloud Functions, security rules, hosting), so these problems are my daily work.
I can fix:
React / JavaScript errors, broken components, state & rendering bugs
Firebase Firestore "Missing or insufficient permissions" and security-rule errors
Firestore queries, missing indexes, data not loading or saving
Cloud Functions errors and deployment issues
Small features and UI fixes
How I work: you send the error, screenshots and access to the code (GitHub/GitLab/zip). I reproduce the bug, fix it, test it, and explain what was wrong. Revisions until it works.
Message me before ordering with your bug details so I can confirm scope and timing.
Respect third-party rights
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Get to know Emma Tong
Emma Tong
React, Firebase developer, web scraping, app security
- FromVietnam
- Member sinceMay 2026
- Avg. response time1 hour
Languages
Vietnamese, English
Hi, I'm Emma, a developer from Vietnam. I build and run a real production app for a retail business on React, Vite, Tailwind and Firebase (Firestore, Cloud Functions, security rules), with POS, inventory, payroll, Gemini AI and TikTok API, tested with Playwright and Vitest.
I help with:
- Bug fixing & features in React / JavaScript / Firebase apps, including Firestore rules.
- Web scraping & data: custom scrapers, Apify Actors, lead lists, PDF/Excel extraction.
- App security: authorization/IDOR testing and Firebase rules review.
I use AI (Cursor) to work fast and test everything.
FAQ
What do you need from me to start?
A short description of the bug, screenshots or error messages, and access to the code (GitHub, GitLab or a zip file). A test account helps if the bug is hard to reproduce.
How long will the fix take?
Basic is usually done in 1 day, Standard in 2 days, Premium in 4 days. I'll confirm the timeline after I see the bug details.
What if the bug is bigger than my package?
What if the bug is bigger than my package? A: Message me before ordering. I'll tell you which package fits, or suggest an Extra / custom offer so there's no surprise.
