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$
USD
I will fix bugs debug and upgrade your react nextjs nodejs or python app
kiarash_atri
About this gig
Fast Bug Fixes and Legacy Code Upgrades React, Next.js, Node.js, NestJS, Python
Your app is broken, slow, or outdated? I will fix it. 6+ years of full-stack experience debugging complex codebases and modernizing legacy projects.
What I Fix:
Runtime errors, crashes, and exceptions Build failures and deployment issues API bugs (REST, GraphQL, WebSocket) Performance problems and memory leaks Authentication and security issues Database query bugs (MongoDB, PostgreSQL, MySQL) CSS/responsive layout issues
What I Upgrade:
JavaScript to TypeScript migration React class components to hooks Next.js Pages Router to App Router Express.js to NestJS refactoring Node.js version upgrades (14 to 20+) React 17 to 19 migration Dependency updates and security patches
My Stack:React, Next.js, NestJS, Node.js, Python, TypeScript, Express, Django, FastAPI
Why Me?
Root cause analysis I fix WHY it broke, not just the symptom Regression testing your fix will not break something else Clear documentation of what was wrong and what I changed Fast turnaround most bugs fixed within 24 hours
Message me with your error or screenshot I will assess it for free.
Get to know kiarash_atri
kiarash_atri
- Last delivery1 year
Languages
English
Other Software Development Services I Offer
FAQ
What frameworks and languages do you work with?
React, Next.js, NestJS, Node.js, Express, Python, Django, FastAPI, and TypeScript. Both frontend and backend debugging.
How fast can you fix my bug?
Most single bugs are fixed within 24 hours. Complex issues or multi-bug packages may take 2-3 days. I will give you an estimate after reviewing your issue.
Do you need access to my codebase?
Yes, I will need access to your repository (GitHub, GitLab, Bitbucket) or a zip of the source code. I work in a secure environment and sign NDAs if needed.
Can you upgrade my old React or Node.js project?
Yes. I specialize in legacy code upgrades including React class to hooks, Pages Router to App Router, Express to NestJS, and major version migrations.
Will fixing the bug break something else?
No. I run regression tests and verify that the fix does not introduce new issues. I also document exactly what was changed and why.
What if the bug comes back after delivery?
All packages include revisions. If the same issue reappears within the revision period, I will fix it at no extra cost.
