I will fix next js app router react node js mongodb javascript html css vibe code bugs

U
ubaidbadar333
U
ubaidbadar333
Ubaid Badar

Level 2

fix next js app router react node js mongodb javascript html css vibe code bugs
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fix next js app router react node js mongodb javascript html css vibe code bugs

About this gig

Are you facing complex bugs, crashes, or performance issues in your web application? I specialize in advanced debugging and deep issue resolution for modern full-stack applications.

I will thoroughly analyze your codebase to identify root causes, not just surface-level bugs. Whether its unexpected app behavior, performance bottlenecks, memory leaks, broken logic, or production-only issues Ill fix it the right way.


What I can help you with

  • Deep debugging of React, Next.js (App Router), Node.js & Express apps
  • MongoDB query issues, schema problems, and performance optimization
  • Fixing runtime errors, build failures, and deployment bugs
  • Performance tuning and code stability improvements

Tech stack

  • React, Next.js (App Router)
  • Node.js, Express
  • MongoDB, JavaScript, TypeScript
  • HTML, CSS


Why choose me

  • Full-stack developer with real production experience
  • Clean, maintainable, and efficient fixes
  • Clear communication and honest recommendations
  • Focus on long-term stability, not quick hacks


If your app needs serious debugging and expert attention, this package is built for you.

Message me before ordering to discuss your issue and avoid surprises.

  • Programming language

    • JavaScript

  • Expertise

    • Debugging
    • Performance
    • Security
    • Design
    • Databases

  • Frontend framework

    • React.js
    • AngularJS
    • Bootstrap
    • Preact
    • Tailwind CSS

  • Backend framework

    • Express.js
    • Node.js

Get to know Ubaid Badar

Ubaid Badar

Expert Web and Mobile App Developer

5.0(601)

Level 2

  • FromPakistan
  • Member sinceDec 2018
  • Avg. response time1 hour
  • Last delivery4 months

  • Languages

    English
Full-stack developer specializing in React, React Native, Next.js, Node.js, MongoDB, and Firebase. I help clients fix bugs, improve performance, and ship stable features without overengineering. I work daily with React & Next.js (App Router), React Native, Node.js, Express, MongoDB, and Firebase (Auth, Firestore, Functions). I’m an active member of the Google Developer Program and use official Google tooling and documentation, including Firebase and Android Studio, to debug efficiently and follow best practices. What you can expect: clear communication, clean maintainable code.

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