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I will debug and fix your mern stack web application
Md Mamun
About this gig
Stuck on a bug that is blocking your launch, or errors you cannot figure out?
I fix bugs and errors in MERN and Next.js applications fast, so you can get back to shipping instead of debugging.
WHAT I OFFER:
- Bug fixing (frontend, backend, or both)
- Error diagnosis and root cause fixes, not just quick patches
- API and database connection issues
- Build and deployment errors
- Console errors, broken UI, and state bugs
- Third-party integration issues (Stripe, auth, APIs)
- Clear explanation of what caused the bug
TECH STACK:
React, Next.js, Node.js, Express, MongoDB, PostgreSQL
WHY WORK WITH ME:
I am a full-stack developer, so I do not just patch the symptom, I trace bugs to their actual source, whether that is frontend state, an API, or the database, and fix it properly.
WHO THIS IS FOR:
Developers stuck on a bug, founders whose app broke before a launch or demo, and teams that inherited messy code with unknown issues.
BEFORE YOU ORDER:
Message me with the bug, error message or video/screenshot, and repo access details so I can scope this accurately.
Lets get your app working again.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Md Mamun
Md Mamun
Software Engineer at OctopusX
- FromBangladesh
- Member sinceOct 2022
- Avg. response time1 hour
Languages
Bengali, English, French, Hindi
I'm a Software Engineer with 3.5+ years of experience in backend development, full-stack web applications, and scalable system architecture. I specialize in NestJS, Next.js, Node.js, PostgreSQL, MongoDB, Redis, Docker, REST APIs, and AI integrations. I've built multiple SaaS products, delivered large-scale production systems, developed 20+ web tools, and designed scalable backend architectures. My focus is delivering clean, secure, maintainable code with clear communication and on-time delivery.
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FAQ
What information do you need from me to start?
Repo access (or the relevant code), a clear description of the bug, and ideally a screenshot, video, or error message. The more detail, the faster I can fix it.
What if you can't fix the bug within the package scope?
If a bug turns out to be bigger than expected during diagnosis, I'll let you know immediately and we can adjust scope with a custom offer — no surprise work done without your approval.
Can you fix bugs in code you didn't originally write?
Yes, most of my bug-fix orders are on codebases I didn't build. I'm comfortable reading and debugging unfamiliar code.
Do you fix deployment or build errors too?
Yes, build failures, environment issues, and deployment errors on Vercel, AWS, or VPS are covered.
How fast can you really deliver?
Basic package is same-day to 1 day for straightforward bugs. Complex issues (Premium tier) may take up to 3 days depending on scope.
Will you explain what caused the bug?
Yes, every delivery includes a short explanation of the root cause so you understand what went wrong, not just that it's "fixed."
