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$
USD
I will fix nextjs react and typescript bugs and deployment issues
Mark U
About this gig
Is your Next.js or React app failing in production, breaking during build, or behaving differently across devices?
I will reproduce the issue, identify the root cause, implement a focused fix, and verify the result. I work with Next.js, React, TypeScript, APIs, authentication, responsive UI, and Vercel deployment workflows.
I can help with:
runtime, build, hydration, and TypeScript errors
broken UI, state, forms, and responsive layouts
API integration and authentication issues
deployment and environment configuration problems
targeted performance and reliability fixes
You receive:
a clean, scoped code change
verification of the agreed issue
a short explanation of the cause and fix
source code and handover notes
Each package covers the scope written in that package. One bug means one independently reproducible issue; related symptoms may share one root cause. Please message me before ordering if the scope is unclear or production access is involved.
I do not provide unauthorized access, credential bypass, or services that violate third-party terms.
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 Mark U
Mark U
Full Stack Developer for Business Websites and AI
- FromLatvia
- Member sinceJan 2025
- Last delivery1 month
Languages
English, Russian, Latvian
I build fast, custom websites and web applications that help businesses build trust and generate enquiries. Recent work includes conversion-focused sites for a general contractor and a welding company, React and Next.js products, AI integrations, and Web3 applications. With 5+ years of full-stack experience, I focus on clear communication, responsive design, performance, clean source code, and reliable deployment. You work directly with me and receive a defined scope, regular updates, and a practical handover.
My Portfolio
FAQ
What issues can you fix?
UI and responsive issues, TypeScript or hydration errors, build failures, broken forms and state, API or authentication problems, and deployment configuration issues.
What counts as one bug?
One independently reproducible problem. Several visible symptoms may count as one bug when they share the same root cause.
What access do you need?
A repository or source archive, reproduction steps, sanitized logs, and least privilege test access when needed. Never send personal passwords or secrets.
Can you start immediately?
Often yes, after I confirm the scope and can reproduce the issue. Message me first if a production release is blocked.
Will I receive the source code?
Yes. You receive the agreed code changes plus a concise explanation of the cause, fix, and verification performed.
Do you work on existing codebases?
Yes. This Gig is designed for existing Next.js, React, and TypeScript projects.
