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$
USD
I will fix nextjs react and nodejs errors build and vercel failures
Shahzad Mumtaz
About this gig
Your app works locally but breaks in production? Hydration errors, failed Vercel builds, crashing APIs, broken auth?
Send me the error. I find the root cause, fix it with the smallest safe change, and tell you why it broke.
I FIX
- Next.js / React: hydration errors, hooks and state bugs, App Router, SSR/SSG
- Build and Vercel/Netlify/Render deployment failures, env variable issues
- Node.js / Express: API crashes, middleware, CORS, 500 errors
- MongoDB / Mongoose: queries, schema, connection issues
- Auth: JWT, sessions, NextAuth, cookies
- Stripe and Firebase integration bugs
- TypeScript errors blocking your build
HOW IT WORKS
1. Message me the exact error, screenshot or repo
2. I confirm scope and the right package before you pay
3. I fix, test the affected flow, and send code + a short root-cause note
YOU GET
- Tested fix, no unnecessary rewrites
- Free re-check for 7 days if the same bug returns
- Private code, NDA on request
Not included: new features or redesigns (custom offer).
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 Shahzad Mumtaz
Shahzad Mumtaz
I will be your full stack MERN, Nextjs, and WordPress developer
- FromPakistan
- Member sinceAug 2023
- Avg. response time1 hour
Languages
Urdu, English
I’m a professional Full-Stack Web Developer specializing in MERN Stack, Next.js, and WordPress. I build modern, responsive, fast, and user-friendly websites and web applications tailored to your needs.
**Expertise:** React.js, Next.js, Node.js, Express.js, MongoDB, REST APIs, Tailwind CSS, WordPress, Elementor, Gutenberg, Kadence & Spectra.
I focus on clean code, reliable functionality, responsive design, security, and performance. Let’s turn your idea into a professional digital solution!
My Portfolio
Other Website Maintenance Services I Offer
FAQ
Do I need to share my whole codebase?
No. The relevant files, a zip, or read-only repo access is enough. I'll ask for more only if I need it.
Can you fix code you didn't write?
Yes. Most of my fixes are in existing projects, in JavaScript or TypeScript, with the Next.js Pages Router or App Router.
What counts as one bug?
One issue with one root cause. Several errors that come from the same cause count as one bug.
What if you can't fix it?
I'll tell you upfront after investigating, and we'll cancel the order so you don't pay for nothing.
Will you add new features?
This gig is for fixing existing issues. For new features or bigger work, message me for a custom offer.
Is my code kept private?
Yes. I don't share or reuse client code, and I'm happy to sign an NDA.
