v0 ships clean frontends, but the backend, auth, and data layers it scaffolds are not production-grade. We harden those: server-side auth, row-level security, secrets off the client, real input validation. Fixed price agreed up front, a working demo every week, and all code and IP yours from day one.
You prompted v0, you got a clean Next.js app in an afternoon, and it looks finished. The components are well-structured, the design is sharp, the demo works. So you point it at real users, and that is where the trouble starts. v0 is one of the best tools out there for generating UI fast. It is not built to enforce server-side authorization, lock down your database, or validate untrusted input, because those calls depend on your stack and your data, not on the prompt. The frontend is done. The backend is a draft.
We take that draft to production. We keep the v0 work you already paid for and harden the layers underneath it, in order of what can actually hurt you. If you want the background first, read is v0 safe, then come back here when you want it fixed.
None of these mean v0 is broken. They mean the prototype was never finished. These are the issues we find most when we open up an app built fast with v0:
NEXT_PUBLIC_ gets shipped to every visitor. On Vercel, secrets also need to be marked sensitive so they are not readable as plaintext.For the broader pattern across AI builders, see is my AI app production-ready and the OWASP Top 10 for vibe-coded apps.
You do not need to rebuild a v0 app. v0 frontends are usually sound. The work is hardening the layers v0 does not own, worst-first.
| Layer | What we do |
|---|---|
| Authentication | Confirm every protected route and API checks auth on the server, not just by hiding UI. |
| Data access | Enable row-level security on every table holding user data. Confirm a user can only read their own rows. |
| Secrets | Grep out NEXT_PUBLIC_ keys, move anything sensitive server-side, mark it sensitive on Vercel, rotate what leaked. |
| Input validation | Validate and sanitize every form, query param, upload, and webhook before it touches a database or shell. |
| Dependencies and secrets scan | Scan for known CVEs and for secrets across the repo and full git history. |
| Tests, rate limiting, monitoring | Add the basics so the app fails loud, not silent, and nobody can abuse it. |
If you are not sure whether yours needs a tune-up or a rebuild, our guide on fix or rebuild a vibe-coded app walks the decision. Most of the time it is a fix.
Same terms on every job, written down before we start:
Most v0 rescues run the same way our wider prototype to production service does. We have shipped production systems for ShapeShift, CoinDesk, Komodo, SALT, and WallStreetBets, so the hardening checklist is not theoretical.
You start with a fixed-price Week-1 build audit at $4,000. We open your v0 app, map every blocker, and hand you a clear scope and price for the fix. Full hardening starts at $14,000, fixed, versus the $60,000-plus and an open hourly meter you would get at a typical US or UK agency.
If you mostly need eyes on the code before deciding, the Due-Diligence Rescue audit is $2,500 and we credit it in full toward the rescue. Want just the security read first? The AI Code Security Audit starts with a free 15-minute pass. Full pricing is on the pricing page.
We find every blocker in your v0 app, or the audit is free. That is the whole deal. You either walk away with a hardened, production-grade app on a fixed price, or you walk away having paid nothing for the audit. Run our free production-readiness check first if you want a sense of where you stand before you talk to us.
Show us your v0 app on a free 15-minute call. We tell you the exact gaps and what the fix takes. No obligation.
Yes, almost always. v0 frontends are usually sound, so we keep them and harden the backend: server-side auth, row-level security, secrets off the client, input validation, tests, and monitoring. We only rebuild a layer when most tables lack access controls or the data model itself is unsafe.
You start with a fixed-price Week-1 build audit at $4,000, which maps every blocker and gives you a clear scope. Full hardening starts at $14,000, fixed, versus $60,000-plus and an open hourly meter at a typical US or UK agency. A free 15-minute audit comes first if you want it.
Usually auth that only exists in the UI, missing row-level security so users can read each other's data, API keys exposed in the browser bundle, and unvalidated input. v0 builds the frontend well. These are all backend and data-layer gaps it was never tuned to handle.
Yes. 100% of the code and IP is transferred to you from day one, and you work in your own repo the whole time. Every job is fixed-price, agreed up front, with a working demo every week before each payment and a 30-day warranty on what we ship.
You get a working demo every week before each payment, so you watch it come together rather than waiting for a big reveal. We back it with our guarantee: we find every blocker or the audit is free, plus a 30-day warranty on the hardening we deliver.
Free 15-min build audit