Will you replace the design?

No. Keeping it is the plan, and it is the reason this engagement is cheaper than starting over.

How do I check my server actions myself?

Open any exported action and look at the database call. If the where clause contains only the id that was passed in, it is unauthorized: reading the session and throwing when it is missing proves the caller is logged in, not that the record is theirs.

Is this more expensive than starting over?

Almost always cheaper. The frontend is typically half a project and it is already finished to a standard most hand-built prototypes do not reach.

I have a demo in two weeks. What can you do by then?

Real accounts, real persistence and real authorization on the two or three flows the demo turns on, deployed on your own domain with monitoring.

Platform playbook

Make your v0 app production-ready

v0 produces the best-looking React in the category: clean components, sensible Tailwind, real accessibility primitives. What it does not produce is a backend, and most v0 projects reach us as a beautiful frontend wired to nothing.

Book a Free Call Start with a free check

Most common critical finding

Exported server actions callable by anyone, reading the session but never checking it against the record being modified.

Production Check: Free, 3–5 days
Typical engagement: 3–6 weeks
Hardening from: $2,000, fixed scope

What we find

Where v0 apps break in production

What actually goes wrong, and why you would not have spotted it yourself. These are the findings we file most often, not a generic checklist.

Finding 01
It looks like a product and saves nothing
Mock data, optimistic UI, and forms that resolve a promise instead of writing a row.
A frontend with no server behind it
Finding 02
Anyone who can reach the page can run the action
Where a backend does exist, actions are exported and callable by anyone who can reach the route.
Server actions without authorization
Finding 03
Private keys end up in the page visitors download
One missing server boundary and a key that was server-only ends up in the bundle.
Secrets pulled across the client boundary
Finding 04
Nothing is stored, so nothing can be reported on
Component props became the schema. Turning that into tables, relations, and migrations is the actual project, and it is the part that was never started.
No data model at all

What we do about it

The v0 fix list

The frontend is normally half a project and yours is done to a good standard.

How the hardening works

Design the data model the UI already implies, then build it with migrations
Put a real backend behind the components: Postgres, auth, server-side validation
Audit every server action for an authorization check against the record, not just the session
Verify the server/client boundary and remove every secret that crossed it
Keep the v0 output as the design system and build production on top of it
Ship it with CI/CD, error tracking, and uptime monitoring in place

How it runs

A typical v0 engagement

Durations from real projects of comparable size. The check is free and everything after it is quoted as fixed scope, so you know the price before we start.

1
Derive the model
3–5 days
We read the components and write down the schema they imply: every mock array is a table, every cross-reference is a foreign key, every filter and sort is an index, every form field is a server-side validation rule.
2
Build the backend
Week 2–4
Database, migrations and constraints; real authentication with sessions, roles and the account lifecycle nobody prototypes; server-side validation on every write.
3
Harden the boundary
Week 4–5
Every server action is audited for an authorization check against the record rather than the session, and a lint rule makes a missing check a failing build.
4
Ship and watch
Week 5–6, then 30 days
Deployment to infrastructure you own with preview environments and rollback, error tracking, uptime monitoring and structured logs - plus the extracted component library and tokens, so the next developer inherits something coherent.

No lock-in

What you keep

Everything we produce belongs to you. If you stop working with us tomorrow, nothing stops running and nothing becomes unmaintainable.

Your accounts and your code
The repository, the cloud accounts, the database and the domain stay in your name.
The report, whatever you decide next
Findings, severity ratings, reproduction steps and effort estimates, written for an engineer.
Infrastructure written down
The environment is defined as code in your repository and comes with a runbook: how to deploy, how to roll back, how to restore, and what to check first.
Your design system
We extract the v0 components, name the tokens and document the patterns rather than replacing them.

Questions

v0 questions we get asked

If yours is not here, ask it on the call. The first one is free and there is no obligation afterwards.

No. Keeping it is the plan, and it is the reason this engagement is cheaper than starting over.
Open any exported action and look at the database call. If the where clause contains only the id that was passed in, it is unauthorized: reading the session and throwing when it is missing proves the caller is logged in, not that the record is theirs.
Almost always cheaper. The frontend is typically half a project and it is already finished to a standard most hand-built prototypes do not reach.
Real accounts, real persistence and real authorization on the two or three flows the demo turns on, deployed on your own domain with monitoring.