Next.js bug fix & audit | React errors | TypeScript by Sergey KovalevNext.js bug fix & audit | React errors | TypeScript by Sergey Kovalev
Next.js bug fix & audit | React errors | TypeScriptSergey Kovalev
Cover image for Next.js bug fix & audit | React errors | TypeScript
Is your Next.js or React app blocked by a build error, TypeScript issue, broken UI, hydration warning, failed form, or deployment problem?
I focus on practical fixes: reproduce the issue, find the root cause, change the code, and leave clear notes so you know what changed.
✅ What I fix • Build and TypeScript errors • Runtime, hydration, and UI bugs • Forms, API responses, and integration issues • Auth, cookies, CORS, and environment/deploy problems
✅ How it works • You share what is broken, logs, and repo or demo access • I reproduce and confirm the issue before changing code • I fix within the scope we agree on and verify the path works • You get a short root-cause summary and handoff (PR, repo, or notes)
✅ Good fit • One clear blocker or a small cluster of related issues • Next.js / React / TypeScript codebases • You need debugging help, not a new marketing site from Figma
📋 Before we start What is broken, expected behavior, screenshots/logs, repo or demo link, deploy target if relevant.
Portfolio: Pearl Dental Care (full-stack app with API, auth, and production-style constraints).
FAQs

Starting at$99
Duration2 days
Tags
JavaScript
MongoDB
Next.js
Node.js
PostgreSQL
React
TypeScript
Backend Engineer
Web Developer
Service provided by
Sergey Kovalev Almaty, Kazakhstan
Next.js bug fix & audit | React errors | TypeScriptSergey Kovalev
Starting at$99
Duration2 days
Tags
JavaScript
MongoDB
Next.js
Node.js
PostgreSQL
React
TypeScript
Backend Engineer
Web Developer
Cover image for Next.js bug fix & audit | React errors | TypeScript
Is your Next.js or React app blocked by a build error, TypeScript issue, broken UI, hydration warning, failed form, or deployment problem?
I focus on practical fixes: reproduce the issue, find the root cause, change the code, and leave clear notes so you know what changed.
✅ What I fix • Build and TypeScript errors • Runtime, hydration, and UI bugs • Forms, API responses, and integration issues • Auth, cookies, CORS, and environment/deploy problems
✅ How it works • You share what is broken, logs, and repo or demo access • I reproduce and confirm the issue before changing code • I fix within the scope we agree on and verify the path works • You get a short root-cause summary and handoff (PR, repo, or notes)
✅ Good fit • One clear blocker or a small cluster of related issues • Next.js / React / TypeScript codebases • You need debugging help, not a new marketing site from Figma
📋 Before we start What is broken, expected behavior, screenshots/logs, repo or demo link, deploy target if relevant.
Portfolio: Pearl Dental Care (full-stack app with API, auth, and production-style constraints).
FAQs

$99