You will get Next.js bug fix & audit | React errors | TypeScript
Project details
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, make the code change, and leave clear notes so you know what changed.
📦 Packages
Starter ($49) - one clear bug/blocker fixed in 1 day (build, TS, runtime, or UI). 1 revision.
Standard ($99) - quick app review + fix the main launch blocker (build, key page, API/form, deploy). 2 days, 2 revisions.
Advanced ($149) - diagnostic pass + several related fixes in one Next/React codebase, with deploy/build help. 3 days, 2 revisions.
What sets this apart: this is not a vague “web development” package. It is for debugging React/Next.js problems with a small, clear scope and code handoff.
✅ Next.js / React / TypeScript focused
✅ Source code changes included in every tier
✅ Responsive/UI fixes when part of the bug
✅ Short root-cause notes + what changed
✅ GitHub/Vercel handoff or notes for your team
📋 Before order: share what is broken, expected behavior, screenshots/logs, repo or demo link. Rough notes are fine.
📋 Build starts when repo/access and reproduction steps are clear.
I focus on practical fixes: reproduce the issue, find the root cause, make the code change, and leave clear notes so you know what changed.
📦 Packages
Starter ($49) - one clear bug/blocker fixed in 1 day (build, TS, runtime, or UI). 1 revision.
Standard ($99) - quick app review + fix the main launch blocker (build, key page, API/form, deploy). 2 days, 2 revisions.
Advanced ($149) - diagnostic pass + several related fixes in one Next/React codebase, with deploy/build help. 3 days, 2 revisions.
What sets this apart: this is not a vague “web development” package. It is for debugging React/Next.js problems with a small, clear scope and code handoff.
✅ Next.js / React / TypeScript focused
✅ Source code changes included in every tier
✅ Responsive/UI fixes when part of the bug
✅ Short root-cause notes + what changed
✅ GitHub/Vercel handoff or notes for your team
📋 Before order: share what is broken, expected behavior, screenshots/logs, repo or demo link. Rough notes are fine.
📋 Build starts when repo/access and reproduction steps are clear.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$49
|
Standard
$99
|
Advanced
$149
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | 1 | 2 | 2 |
Number of Pages | 1 | 1 | 1 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$29Frequently asked questions
4 reviews
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JS
Jai S.
Feb 28, 2023
Figma to HTML using Bootstrap rows, columns & grids
Sergey did what we asked & did his best do re-create our design. He communicates well & is knowledgeable in Flask & Bootstrap!
JZ
John Z.
Feb 4, 2023
WP Image issue
Great work, solved our problem effortlessly. Recommended!
OK
Oksana K.
Nov 3, 2022
Design & develop a Landing page
Great job!
ho
helmut o.
Aug 13, 2022
4 Page Responsive Website Required
Very competent and diligent professional. Sergey went out of his way to understand our requirements and over delivered on expectations. Look forward to working with him again!
About Sergey
Senior Full-Stack Web Developer for Sites, Landings & Handoffs
Almaty, Kazakhstan - 3:59 pm local time
I build work that earns trust and drives the next step you need - contact, quotes, intake, or bookings - for businesses that care about clarity, credibility, and a site your team can run after launch.
✨ What you get: a clear offer on the page, working forms and CTAs, mobile-friendly layout, and handoff you can actually maintain.
🛠 Work I take on:
• Full-stack web apps (Next.js / React + Node.js APIs, auth, payments, integrations)
• Business websites (WordPress, Squarespace, Tilda, Webflow)
• Sites from Figma or your brief + brand assets
• Landing pages and service sites
• Site updates, forms, and SEO basics on your copy
📈 How I work: agreed scope in writing, preview links, fixed milestones, clean access handoff. Updates in Upwork messages.
🤝 Portfolio: business and service sites, landings, CMS builds, and full-stack projects with forms and APIs - see work attached to my profile.
⚙ React, Next.js, TypeScript, Node.js, PostgreSQL, Vercel - or the CMS that fits your team.
Send your post or mockups with priority pages - I will reply with a short plan.
Steps for completing your project
After purchasing the project, send requirements so Sergey can start the project.
Delivery time starts when Sergey receives requirements from you.
Sergey works on your project following the steps below.
Revisions may occur after the delivery date.
Kickoff & access
Confirm tier ($49 / $99 / $149), repo/demo access, steps to reproduce, expected behavior, exact error/logs, and deploy target if relevant.
Reproduce the issue
Run the app/build locally or review the failing page/deploy so the bug is confirmed before changing code.