I will fix and optimize your react or nextjs application

Q
qasimfida0054
Q
qasimfida0054
Qasim F
fix and optimize your react or nextjs application
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fix and optimize your react or nextjs application

About this gig

Is your React or Next.js app slow, buggy, or messy? I fix it.

I have 10+ years of experience debugging, optimizing, and refactoring production React and Next.js applications. I've worked on platforms serving 1.2 million users. I know how to find the root cause, not just patch the symptom.

What I fix:

  • Bugs and runtime errors
  • Performance bottlenecks (slow loads, laggy UI)
  • Responsive design issues (mobile, tablet, desktop)
  • Messy or unmaintainable code
  • Build and deployment errors
  • State management issues

What you get:

  • Clean, tested fixes
  • Clear explanation of what was wrong and what I changed
  • Better performance and stability
  • Documented code

Why me:

  • 10+ years full-stack engineering
  • Built GenComm AI, Cathoven, Gilgit, Glance Care
  • Use Claude Code daily for fast, accurate debugging
  • 80+ projects shipped

Packages:

  • Basic: One bug fix
  • Standard: Multiple bugs + performance optimization
  • Premium: Full codebase audit and refactor

Message me before ordering so I can review your issue.


Regard:

Qasim

  • Platform

    • Webflow

  • Website type

    • Business
    • Landing page
    • Portfolio
    • Entertainment

  • Programming language

    • JavaScript
    • Python
    • TypeScript
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 Qasim F

Qasim F

Sr Full Stack Developer and AI Developer

  • FromPakistan
  • Member sinceSep 2019
  • Avg. response time1 hour

  • Languages

    Urdu, English, Hindi
Have a big idea or a product that needs a fresh start? I help startups and businesses turn complex ideas into scalable, high-performance digital products. With 10+ years of experience, I specialize in React, Next.js, Vue.js, Svelte, Node.js, and NestJS, building SaaS platforms, web applications, APIs, and AI-powered solutions. Having delivered 80+ applications and integrated 1,500+ complex APIs, I focus on clean architecture, performance, security, and long-term scalability. From MVPs to enterprise systems, I build reliable products designed to grow with your business.

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