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Fiverr Pro
English
$
USD
I will fix, improve and optimize your existing web application
Henry Cole
About this gig
Is your web application broken, slow, difficult to maintain, or missing a feature?
I help startups, businesses, and developers fix and improve existing web applications without unnecessary rebuilds.
I CAN HELP WITH
- React and Next.js bugs
- Node.js backend issues
- JavaScript and TypeScript errors
- API and database problems
- Authentication issues
- Broken forms and user flows
- Performance improvements
- UI fixes
- New feature development
- Code refactoring and cleanup
- AI-powered features
TECHNOLOGY
React, Next.js, JavaScript, TypeScript, Node.js, Python, REST APIs, Supabase, Firebase, SQL databases, and Claude Code.
I use Claude Code to accelerate development while carefully reviewing and testing the final solution.
HOW IT WORKS
Send me your application link, repository, error message, screenshots, or feature requirements. I will diagnose the issue, implement the fix or improvement, and test the result.
You may not need a complete rebuild. I will preserve useful parts of your existing codebase whenever practical.
For complex projects or multiple features, please message me before ordering so I can review the scope and recommend the right package.
Get to know Henry Cole
Henry Cole
AI Full Stack Developer SaaS AI Automation Expert
- FromNigeria
- Member sinceMay 2026
- Avg. response time1 hour
Languages
Yoruba, English, Spanish, French, German, Italian, Arabic, Portuguese, Japanese, Ukrainian, Greek, Russian
I'm Henry, a Full-Stack AI Developer with 5+ years of experience building, fixing, and optimizing modern web applications.
I specialize in Claude Code, Claude AI, SaaS MVPs, React, Next.js, Node.js, API integrations, bug fixing, Apple Pay, StoreKit, TestFlight, and Xcode.
I deliver clean, scalable, production-ready solutions with clear communication and fast turnaround. Need to build, debug, or improve your application?
Send me a message I'd love to discuss your project and recommend the best solution.
My Portfolio
FAQ
Can you work with my existing web application?
Yes. I can work with existing React, Next.js, Node.js, JavaScript, TypeScript, and other modern web applications to fix bugs, add features, and improve functionality.
Do I need to rebuild my application?
Not necessarily. I first look at the existing application and determine whether the problem can be fixed or improved without a complete rebuild.
Can you fix a bug if I don't know what's causing it?
Yes. Send me the error, affected page, screenshot, repository, or application link and I can investigate the underlying issue.
Can you add a new feature to my existing application?
Yes. I can add defined features while working within the existing application's architecture.
Can you fix API or database problems?
Yes. I can troubleshoot API requests, authentication, database connections, and related backend issues.
Can you improve application performance?
Yes. I can investigate common performance bottlenecks and implement improvements where appropriate.
Do you use Claude Code?
Yes. I use Claude Code as part of my development workflow to accelerate implementation, debugging, and code exploration while reviewing the resulting work using normal software-engineering practices.
Can you deploy the changes?
Deployment assistance can be included when it is within the agreed project scope. Please discuss deployment requirements before ordering.
