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Fiverr Pro
English
$
USD
I will fix bugs in your nextjs and supabase web app
Daniel Marquez
About this gig
Something broken in your Next.js app and you need it fixed properly, not patched?
I have been building with this exact stack since 2021: Next.js, TypeScript, React, Supabase, PostgreSQL, Tailwind and Vercel. I do not guess. I find the cause, fix it, and tell you in plain language what was wrong and why.
WHAT I CAN HELP WITH
- Runtime and build errors
- Supabase auth, RLS policies and 401 or 42501 errors
- Broken API routes and server actions
- Database queries and schema fixes
- Deployment failures on Vercel
- Adding a new feature to an existing app
HOW I WORK
You send me repository access and a clear description of the problem. I reproduce it, fix it, and deliver a short written note explaining the cause. No silent changes.
I am a native Spanish speaker based in Argentina, so I work in American business hours and we can talk in real time.
Not sure which package fits? Message me with the error and I will tell you honestly before you order.
Get to know Daniel Marquez
Daniel Marquez
Full Stack Web Developer Custom web apps with Next js and Supabase
- FromArgentina
- Member sinceAug 2026
Languages
Spanish, English
I build custom web applications end to end — interface, backend, database, security and deployment. My stack is Next.js, TypeScript, Supabase/PostgreSQL, Tailwind and Vercel.
Before writing code, I write the spec: screens, data model, milestones and acceptance criteria. That is what makes a fixed price honest instead of a guess.
Native Spanish speaker, based in Argentina — I work in American time zones, so we can talk in real time during your business hours.
Tell me the problem you need to solve and I'll tell you straight whether I'm the right person for it.
FAQ
I do not know which package I need. What do I do?
Message me first with the error message or a description of the problem. I will tell you which package fits, or tell you if this is not something I can help with. It costs you nothing to ask.
Do I get the source code?
Yes, always, in every package. The code is yours. That is not an extra and never will be.
What do you need from me to start?
Repository access or a zip of the project, a clear description of what is broken, and whether this is production or a staging environment. If you have the exact error message, paste it.
Can we talk directly?
Yes. Once the order is placed we can use Fiverr's video call feature. I am in Argentina, so I am available during American business hours, and I speak native Spanish if you prefer.
