Built your app with v0? Let’s make the back end as good as the UI.

v0 builds some of the best-looking interfaces of any AI tool, on Next.js, the same framework serious teams ship with. The risk sits behind the UI: server actions, auth and data access that nobody has really checked.

I’m a fractional CTO who ships Next.js on Vercel in production every day. I audit your v0 app in 48 hours and tell you exactly what to fix before real users and real money arrive.

Book a 30-min call or see packages and pricing

What v0 gives you

Front end: Next.js with the App Router, React, Tailwind and shadcn/ui. This is v0’s strongest part.
Back end: API routes and server actions in the same Next.js app, with a database such as Supabase or Neon connected through Vercel.
Hosting: Vercel, one click from v0, with a preview deployment for every change. The code can live in your own GitHub.
Left to you: Auth checks inside every server action, real configuration instead of placeholders, database rules, payment edge cases, tests and monitoring.

Where v0 apps break

Server actions anyone can call

Every server action is a public endpoint under the hood. If it doesn’t check who’s calling and validate what they sent, anyone can call it directly and skip your UI entirely.

Placeholders that never got replaced

v0 wires things up with placeholder environment variables, sample data and callbacks pointing at localhost. They look fine in the preview and fail, or half work, in production.

Secrets in NEXT_PUBLIC_ variables

Anything prefixed NEXT_PUBLIC_ is baked into the JavaScript every visitor downloads. Keys for Stripe, OpenAI or your database belong on the server only.

Login that breaks on previews

Each Vercel preview gets its own URL, and sign-in providers reject callbacks they don’t recognize. Teams end up testing login only in production.

A polished front end on a thin back end

v0 shines at UI. The data model, access rules and payment logic behind it are usually the least reviewed part of the app, and the part that hurts most when it fails.

Three ways forward

The audit tells you which one fits

Option 1
Harden it in place
Best when the app is small and v0 still speeds you up.
Add auth checks and validation to every server action, replace placeholders with real configuration, lock down the database, and add monitoring. Keep generating UI with v0 on top of that.
Option 2
Own the workflow
Best when you have paying users or a second developer.
Code in your GitHub with preview deployments, a staging database, CI with tests, and code review on everything v0 produces. v0 becomes a UI tool inside a normal engineering workflow.
Option 3
Build out the back end
Best when the product needs real business logic, integrations or scale.
Keep the v0 front end and build a proper back end behind it: data model, auth, payments, background jobs and the integrations your product needs.

Questions

Is the code v0 generates production-ready?

The UI is usually close. The parts to check are the ones users can’t see: server actions, auth, database access and configuration. That’s where the audit spends its time.

Can I keep using v0?

Yes. With the code in GitHub and a review step, v0 is a great way to build new screens. I set it up so its changes go through the same checks as any developer’s.

Do I have to stay on Vercel?

No, but there’s rarely a reason to leave early. A Next.js app runs on other hosts too, and I’ll tell you if your traffic or costs make a move worth it.

Start with a 48-hour audit

Usually reply within a day

A fixed $1,500 review of your v0 app: database rules, secrets, payments, reliability, performance and code. You get a ranked fix list within 48 hours of giving me access, and a clear call on which path fits. See everything the audit covers.

Book a 30-min call