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$
USD
I will fix react nextjs typescript and spring boot bugs and errors in 24 hours
Yusuf K
About this gig
Hi, I'm Yusuf - a full-stack developer. Something in your app is broken and you have spent hours on it. Send it to me and I'll find out why - most single bugs are fixed within 24 hours.
WHAT I FIX
React and NextJS: broken state, infinite re-renders, hydration errors, routing and build failures
TypeScript and JavaScript errors that block your build
Spring Boot and Java: 500 errors, JPA and query problems, failing authentication, CORS
API calls that return the wrong data or nothing at all
Deployment errors on Vercel, Render or Docker
WHAT YOU GET
The bug actually fixed, not a workaround
A plain-English explanation of what was wrong and why
Clean code that matches the style of your project
On the Premium package, tests that make sure the bug cannot come back
WHY ME
I build and ship React, NextJS and Spring Boot apps myself, so I read unfamiliar code fast. I work with tests, debuggers and logs rather than guesswork, and I tell you honestly when a bug needs more than a quick patch.
HOW IT WORKS
Send me the error message and the steps to reproduce it. I'll confirm whether I can fix it before you order. If I can't fix it, you get a full refund.
Get to know Yusuf K
Yusuf K
FullStack Developer
- FromTurkey
- Member sinceMay 2026
Languages
English, Turkish
I'm a full-stack developer building web apps end to end - React, Next.js and TypeScript on the front end, Java, Spring Boot and PostgreSQL on the back end.
I can help with new websites and web apps, landing pages, admin dashboards, REST API development and integration, database design and bug fixing.
Recent work: a car rental & transfer company site with a custom admin panel, plus deployed projects in error tracking, real-time chat and multi-tenant SaaS. I write tested, secure code, reply fast, and stay with the project until you're happy.
My Portfolio
Other Software Development Services I Offer
FAQ
What if you cannot fix the bug?
Then you get a full refund. Send me the error before you order and I will tell you honestly whether I can fix it, so this almost never happens.
Do I have to give you my whole repository?
No. The relevant files are usually enough, or a private branch you can revoke afterwards. I never push to your main branch without permission and I never share your code with anyone.
How fast can you start?
Usually within a few hours of your order, and a single bug is often delivered the same day. If I am busy I tell you upfront instead of letting you wait.
