I will fix bugs or add a feature to your next js react or mern stack app


About this gig
Something broken? Need a feature added fast?
I fix bugs and add features to existing Next.js, React, and MERN stack apps. No need to explain your entire codebase just tell me what's wrong or what you need, share your repo, and I'll get it done.
What I can fix
- Auth issues JWT, sessions, login/logout bugs
- API errors broken endpoints, CORS, data not saving
- UI bugs layout broken, component not rendering, state issues
- Database problems MongoDB queries, schema issues
- Deployment failures Vercel, Render, env variable issues
- Performance slow pages, unnecessary re-renders
What I can add
- A new page or screen
- A REST API endpoint
- A form with validation and backend connection
- Role-based access or auth guard
- A small dashboard or data table
- AI / LLM integration (ChatGPT, Gemini)
How it works
1. Message me with your issue and share your repo
2. I confirm scope and timeline before you order
3. I fix it, test it, and deliver clean code
I don't guess if I'm not sure I can fix it, I'll tell you before you pay.
Message me first so we can confirm your issue fits the package.
Get to know M.Abdullah
Full Stack Engineer, Next js, MERN Stack, AI Integration
- FromPakistan
- Member sinceFeb 2026
- Avg. response time1 hour
Languages
English
My Portfolio
FAQ
How do I share my code with you?
A GitHub repo link is easiest. If your code is private, you can add me as a collaborator or share a zip file via Fiverr's delivery system.
What if you can't fix my bug?
I'll tell you before you order. I review your issue first so there are no surprises. If it's outside my scope I'll say so upfront.
Do you work on codebases you didn't write?
Yes — that's exactly what this gig is for. I'm comfortable jumping into existing Next.js, React, and MERN projects and understanding the structure quickl
What if my issue turns out to be bigger than expected?
I'll message you before doing any extra work. You'll always know the scope and cost before I proceed.

