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I will fix react next javascript or typescript bugs in your web app
Ilya Kantkouski
About this gig
React / Next.js Bug Fixes & Debugging
Is your React or Next.js app crashing, showing errors, or behaving unexpectedly? I will quickly find the root cause and fix it with clean, maintainable code.
About me
Front-End Developer with 6+ years of experience in fintech, SaaS dashboards, and high-traffic web apps.
What I can help you with
React / Next.js errors & bug fixes
JavaScript / TypeScript debugging
UI glitches & responsive layout issues
API integration problems (REST / GraphQL)
Performance optimization (slow renders, heavy components)
State management issues (Redux Toolkit / RTK Query)
Tech stack
React, Redux, Next.js, TypeScript, JavaScript, Redux Toolkit, RTK Query, Material UI, CSS (SCSS, SASS), HTML
⭐ Why clients choose me
Clear communication
Fast delivery
Stable and scalable solutions
Support 24/7
Please message me before ordering so I can review your issue and recommend the best package.
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 Ilya Kantkouski
Ilya Kantkouski
Senior Frontend Developer
- FromBelarus
- Member sinceMar 2026
Languages
Belarusian, Russian, English, Polish
Front-End Developer with 6+ years of experience building fast and scalable web applications.
I specialize in React and TypeScript and have worked on fintech platforms, large e-commerce projects, and data dashboards. I focus on clean architecture, performance, and user-friendly interfaces.
I can help with React / Next.js development, Figma to responsive UI, dashboards and admin panels, API integration (REST / GraphQL), bug fixing, and performance optimization.
Stack: React, Next.js, TypeScript, Redux Toolkit, RTK Query, Material UI, HTML, CSS, SCSS.
FAQ
What information do you need to fix my bug?
Please send a clear description of the issue, error messages (if any), screenshots, and access to the relevant code or repository. If possible, also include steps to reproduce the problem.
Can you fix bugs in existing React or Next.js projects?
Yes. I specialize in debugging existing applications and fixing issues in React, Next.js, JavaScript, and TypeScript projects.
Do you need access to my repository?
In most cases yes. Access to the GitHub or project files helps me quickly identify the problem and implement the correct fix.
What if the issue is more complex than expected?
If the issue requires more work than the selected package includes, I will explain the situation and suggest the best solution or a custom offer.
Can you fix my website if it is not built with React?
Yes, in many cases I can. I work with JavaScript and TypeScript projects including React, Next.js and other modern web applications. If your website uses a different technology, please send me the link and describe the issue so I can confirm if I can fix it.
