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Fiverr Pro
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I will fix react nextjs javascript typescript bugs and errors
Seungyong Oh
About this gig
Is your React or Next.js website showing errors, broken layouts, or unexpected behavior?
I will diagnose and fix bugs in your React, Next.js, JavaScript, or TypeScript project.
I can help with:
React and Next.js errors
JavaScript and TypeScript bugs
HTML and CSS layout issues
Responsive and mobile UI problems
API integration issues
Component and state errors
Build and deployment problems
Basic Node.js and backend issues
I have hands-on experience building and launching real full-stack web products, so I understand both frontend and backend issues rather than only visual fixes.
I focus on finding the actual cause of the problem, implementing a clean fix, and checking that the issue is resolved.
Please message me before ordering if the issue involves multiple bugs, authentication, database problems, deployment, or a complex existing codebase.
Get to know Seungyong Oh
Seungyong Oh
Full Stack Web and Mobile App Developer, Korean Localization and Market Research
- FromSouth Korea
- Member sinceSep 2026
Languages
Korean
I’m a web developer and independent product builder based in South Korea. I build and maintain full-stack web applications using React, Next.js, TypeScript, APIs, and databases. I independently built and launched DoNa, a web and mobile date-course recommendation service, and developed QuoteCrate, a Shopify B2B quoting app. I also help international clients with Korean localization, supplier research, competitor research, local business research, and Korea market research. I focus on clear communication, practical solutions, reliable delivery, and organized results clients can use immediately.
My Portfolio
FAQ
What kind of bugs can you fix?
I can fix React, Next.js, JavaScript, TypeScript, HTML, CSS, API, responsive design, build, deployment, and basic backend issues.
Can you fix bugs in an existing project?
Yes. Most of my bug fixing work is done on existing projects. I will review the issue and existing code before making changes.
Can you fix API or backend issues?
Yes. I can investigate API integration, Node.js, database connection, and related full-stack issues. Please contact me first for complex backend problems.
What if you cannot reproduce the bug?
Please provide clear steps, screenshots, videos, error messages, or logs. I will review the information before starting the work.
Can you add new features too?
Small changes related to the bug may be possible, but this Gig is primarily for bug fixing. Larger new features require a custom offer.
