Browse categories
English
$
USD
Connect to your AI
I will fix nextjs and react bugs, errors, hydration, build and vercel deployment issues
Alex Hiep
About this gig
Hi there! Thanks for stopping by, I'm glad you're here.
Is your React or Next.js website showing errors, a blank white screen, or a hydration mismatch? Does npm run build fail, or does your Vercel deployment keep breaking? I'll fix it, fast and properly.
I find the root cause instead of patching symptoms, so the same bug does not come back next week. Not technical? Just send a screenshot of the error.
What I fix:
- Hydration errors, white screens and console errors
- Build failed and Vercel or Netlify deploy issues
- 404 on refresh, routing, API routes and middleware
- Env variables, CORS, API and Stripe integrations
- Login and auth (NextAuth, Clerk, Supabase, Firebase)
- Broken mobile layouts and responsive CSS (Tailwind)
- Slow pages, Core Web Vitals and Google speed scores
- Apps built with Lovable, Bolt, v0 or Cursor
Real result on a store I built: Google mobile speed score from 61 to 100.
What you get:
- A clean, tested fix in your repo or a zip
- A short note of what was wrong and what changed
- Premium adds a full report and a screen recording
Send me a message before ordering and I'll review your project for free. Thank you, and I look forward to getting your website working!
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 Alex Hiep
Alex Hiep
Full Stack Web Developer, Nextjs, Shopify, AI Apps and Automation
- FromVietnam
- Member sinceOct 2026
Languages
English, Spanish, French, German, Italian, Portuguese, Chinese, Hindi
Hi, I'm Alex! I'm a web developer with 5+ years of experience and a background in Information Systems, and I build with AI every day. I fix bugs, build fast, clean websites (React, Next.js, Supabase, Node.js) and finish apps made with Lovable, Bolt, Cursor, Antigravity or Claude Code. I also create AI mobile apps (React Native), AI chatbots and n8n, Make or Zapier automations, and I design YouTube thumbnails and edit videos and captioned Shorts in DaVinci Resolve and Photoshop. I personally test every delivery. Send me your idea and you'll get an honest plan, fast. Let's build something great!
My Portfolio
FAQ
Which React and Next.js versions do you work with?
React 17 to 19 and Next.js 12 to 16, with both the App Router and the Pages Router. Vite, Create React App, TypeScript and JavaScript projects are all fine, and so are Tailwind, shadcn/ui, Supabase, Firebase and Prisma. Not sure what your project uses? Send me the repo and I will check it for you.
My site works locally but fails to build or deploy on Vercel. Can you fix it?
Yes. I fixed this on two Next.js apps I built: next build failed, so I reproduced it, made it pass locally, then made sure the same build runs on Vercel or Netlify. I also check env variables, Node versions and build settings, so the next deploy does not break. You get a short note of the cause.
What do you need from me to get started?
Access to your GitHub repo (a collaborator invite) or a zip, the steps to reproduce the bug, and any error messages or screenshots. If the app needs API keys, send only their names from .env.example. Never send me your passwords: a collaborator invite is enough for me to work on it safely.
How fast can you deliver?
A Quick Fix is delivered within 1 day, Fix and Stabilize in 3 days and Production Ready in 5 days. Standard and Premium also have an Extra fast delivery option. In a rush? Message me first and I will tell you honestly how fast I can do it before you place your order, with no surprises at all.
What if the problem is bigger than expected?
I review your project before you order, so the price is clear. If the problem turns out bigger than agreed, I tell you right away, explain why and show you the options. Nothing extra is ever added without your approval, and you always know exactly what you pay for and what you get back.
Will you change my design or features?
No. I keep your design, content and features exactly as they are and only touch the code needed for the fix, unless you ask me to change something. Every change is listed in the delivery note, so you can review it, and your repo history stays clean with small, clear commits you can follow.
Do you offer support after delivery?
Yes. If something related to my fix does not work as agreed, just message me and I will fix it. Revisions are included in every package: 2 in Basic, 3 in Standard and 4 in Premium. I also answer quick questions about the fix after delivery, so you are never left alone with the new code.
My website was built with an AI tool (Lovable, v0, Cursor). Can you still fix it?
Yes. I fix code from Lovable, Bolt, v0, Cursor, Claude Code and other AI tools too. AI-built apps often hide the same bugs: broken auth, missing env variables and hydration errors. I clean up the root cause, not just the error, so you can keep building new features on top of it with confidence.
I am not a developer. Can you still help me?
Yes. Send me a screenshot of the error and tell me what should happen instead. I explain the problem in plain English, fix it, and tell you exactly what changed. You do not need to know any code: I can also guide you step by step to invite me to your repo or your hosting safely and quickly.
