Maya is a designer-turned-founder. She generated 240 Vercel v0 components in two months. Her app looked like it cost £200K to build. Then her senior engineer hire opened the repo: 240 components, zero shared tokens, three state libraries, four ways to fetch data, and a Vercel KV store being used as the production database.
Rescue v0 Vercel code review · Server Action security · UK
Vercel v0 production audit for the app that won’t pass review.
Your Vercel v0 app shipped and looked like it cost £200K. Now it won’t pass review: 247 shadcn component variants, Server Actions anyone can hit via direct POST with no auth, and a Vercel KV store doing the job of a production database. In 5 days, two senior engineers hand you a fix list ranked Critical, High and Medium. £8K fixed.
24hreply, from a senior
200+projects shipped since 2019
Senioronly, on the spine
Why founders book the v0 audit
Your Vercel v0 codebase shipped fast. Now find out what’s missing before someone else does.
An independent Vercel v0 production audit. Eight delivered since 2024. Sixteen critical or high-severity findings in the average codebase. Most founders are surprised by the report.
“The app worked in the demo, so nobody had checked what was underneath the demo.”
001
8
Independent Vercel v0 audits delivered since 2024.
002
16
Critical or high-severity findings in the average codebase.
003
5 days
From signed NDA to a written report with a prioritised fix list.
The founder this page is for240 components · KV as the prod DB · 16 findings
Maya shipped fast. The app looked finished. The repo told another story.
He quit during the second week. The seed lead asked one question: “Has anyone independent looked at this yet?” Nobody had. The app worked in the demo, so nobody had checked what was underneath the demo.
We ran the 5-day audit. Sixteen findings. Five critical: KV at 95% capacity, no real auth boundary, secrets in client bundles, no rate limit on AI calls, no tenant isolation. She had the written report on day six. This page is for founders who’d rather know what’s in their Vercel v0 codebase before the seed lead does.
THE VERCEL v0 PRODUCTION AUDIT · THE 5-DAY WINDOW
5 days. Four assessments. One written report.
Same shape every audit. NDA Monday morning, written report Friday afternoon, with the consolidation PR as an optional fifth.
Security assessment
OWASP Top-10 penetration test against your live Vercel v0 app. Server Action auth review, session and token handling, dependency audit, secret scanning. Day 1.
Architecture review
Schema review, multi-tenant boundaries, Vercel KV migration path, data-flow diagram, state-management audit, webhook reliability, and a load model at 10× current traffic. Day 2.
Code quality + test coverage
Static analysis, the shadcn duplicate map, a dead-code report, test-coverage figures, logging and observability audit, CI/CD review, deploy-rollback path tested. Day 3.
Compliance + written report
SOC-2 readiness checklist, UK GDPR data handling, DPA template and sub-processor list, plus a 30-page report with severity-ranked findings, sample code, and effort estimates. Day 4-5.
The finding. The severity it earns.
v0 is brilliant at generating components. It’s not a design system, a state manager, or a database. You can’t blame the tool. You can fix the gaps before someone else finds them.
- 01
“The app reads and writes everything from Vercel KV.”
KV is a key-value cache, not a database. Multi-tenant scoping is impossible, costs spiral past £500/mo at modest scale, and Vercel sunsetted KV mid-2025. We map the migration to Postgres.
- 02
“Our app calls OpenAI directly from the client with no per-user limit.”
One bored visitor burns the monthly budget. v0-generated apps wire model calls without a per-user rate limit. We add gating before the bill incident, not after it.
- 03
“Every prompt generated a new component. Maintenance is impossible.”
v0 generates a new component per prompt. After three months you have 247 button variants, 14 modals, 6 nav bars. The consolidation PR cuts them to 38 primitives without touching the UI.
- 04
“Anyone can hit our Server Actions via a direct POST.”
v0 generates them as public HTTP endpoints. No auth, no authz, no input validation by default. We test every Action and document which ones a stranger can call right now.
- 05
“Who changed what, when, and why? No record exists.”
Every mutation runs silently. When the SOC-2 audit asks for change history, it becomes a six-month panic. We specify the audit-log schema in the report.
- 06
“Full name, email, and billing address sit in React state.”
Visible in browser dev tools to anyone logged in. Customer PII loaded client-side leaks to every authenticated user. We map what moves server-side.
- 07
“The customer list takes 14 seconds at 5K records.”
At 50K records it times out. Today it’s fine. In three months it’s an outage. The audit lists the indexes you need before that happens.
- 08
“Stripe and OpenAI keys are in a .env file in Git history.”
Git blame says ‘v0’. Live credentials in plain text, committed to history. We hand you the full secret-scan report and a rotation plan.
- 09
“Login and signup accept unlimited requests.”
Brute force becomes possible. No throttle, no anomaly detection. We test it on day one and specify the limits that close the door.
- 10
“The first enterprise customer asked for a security questionnaire and a DPA.”
You have neither, so the deal stalls. The audit ships the readiness checklist, the DPA template, and the sub-processor list. The questionnaire takes two hours, not two months.
Recent client · UK proptech · 2025
Maya’s Vercel v0 codebase,
Maya’s Vercel v0 codebase,
after the audit, in numbers
Brief: audit the v0-built SaaS before raising seed. We found 16 issues, five critical. Maya fixed the critical five with us across a 6-week sprint. Components consolidated from 240 to 38 reusable primitives. The senior engineer was offered the role again, accepted, and ramped in week one.
The audit
16
Findings, 5 critical resolved
5
Day audit, report on day 6
Consolidation
24038
Components, no UI change
6
Week fix sprint
The outcome
2.4×
Seed closed at planned valuation
0
Audit reports leaked, ever
WHAT SHIPS IN THE WRITTEN REPORT
The security + compliance pack your prospect was about to ask for
Thirty pages. Severity-ranked. Sample code per finding. The document your enterprise prospect, seed lead, and acquirer’s CTO each want to see.
REPORT(01)
OWASP Top-10 pen-test summary
Every category tested against your live Vercel v0 app. Pass or fail per row. Sample attack plus remediation per failure.
Server Action reviewSecret scanDependency auditSample attacks
OWASP Top-10 pen-test summary
REPORT(02)
Severity-ranked finding list
Critical, High, Medium, Low. Effort estimate per fix in GBP and engineering days, so your CTO reads it once and acts.
GBP estimatesEngineering daysSample codeRecommended pattern
Severity-ranked finding list
REPORT(03)
Auth + session review
Token expiry, refresh, RLS coverage, anon-key handling, MFA path, and every Server Action a stranger can call today.
RLS coverageMFA pathAnon-key handlingServer Actions
Auth + session review
REPORT(04)
SOC-2 readiness + UK GDPR / DPA pack
Every control assessed with an 8-12 week path to ready. Signed DPA template, sub-processor list, data-flow diagram, and a ROPA your DPO can sign without rewriting.
SOC-2 gap listDPA templateSub-processor listROPA
SOC-2 readiness + UK GDPR / DPA pack
REPORT(05)
Architecture brief + ADR draft
One-page architecture, six suggested ADRs, and a load model at 10× traffic. The diligence pack an acquirer’s CTO walks through without flinching.
Six ADRsLoad modelKV migration pathThreat model
Architecture brief + ADR draft
Three ways to start. The audit fee is fixed.
The £8K audit is the same number every time. Everything after it is line-itemed and your call.
5-day audit
£8K fixed. 30-page written report, severity-ranked, effort estimate per fix. You walk away with the report, no strings.
- OWASP-grade pen test
- Architecture + scale model
- SOC-2 + DPA pack
- No commitment to fix with us
2-4 week fix sprint
£18K-30K total. We fix the critical findings. You keep Vercel v0 for the rest. Behind-flag deploy, zero customer-facing downtime.
- Audit plus four critical fixes
- Idempotent billing
- Auth + RLS hardened
- Audit log on every mutation
6-12 week rebuild
£28K-60K total. Full rebuild on MERN + AWS. Same v0 UI, a new defensible spine, zero-downtime cutover.
- Same UI, new spine
- Acquirer-ready ADRs
- 30-day walk-away both ways
- IP assigns on every commit
What founders actually ask about the audit
Pain-first, soft-second.
The honest answer: probably not yet, and that’s normal. Across eight Vercel v0 audits, every codebase had at least three critical findings: an ungated Server Action, a billing race condition, a tenant-isolation hole, or a missing audit log. v0 is a brilliant builder. It’s not a security platform. The 5-day audit tells you what’s missing, ranked by severity, with effort estimates.
No. Every founder we audit shipped fast with the tools that worked. We’re not judging your speed. We’re telling you what to fix before someone else finds it. The report is written for you, not against you. We’ve never named-and-shamed a client and we never will.
5 days of senior engineering attention on your codebase. An OWASP-grade penetration test against your live Vercel v0 app. Architecture review. A load model at 10× current traffic. SOC-2 readiness checklist. UK GDPR and DPA pack. Code quality and test-coverage report. A 30-page report with severity-ranked findings, sample code per finding, and effort estimates in GBP and engineering days. You can walk away after the audit. Most founders don’t, but the option is real.
Yes. The consolidation PR cuts 247 shadcn variants to roughly 38 reusable primitives without touching a single pixel. We map every button-1 / button-2 / card-variant duplicate to a shared primitive, move hard-coded Tailwind utilities into design tokens, and ship it behind review. On Maya’s codebase the count went from 240 to 38 and the UI was identical.
No. The audit runs against a staging copy of your codebase, with a separate environment for penetration testing. Your production stays untouched. Your customers don’t see a thing.
Yes. The report is written so your engineer can fix the findings without us. Every finding has sample code, an effort estimate, and a recommended pattern. About a third of our audited clients fix in-house, about a third use us for the critical fixes only, and about a third move to a full rebuild. All three paths are fine. You decide on day six.
For most cases, yes. The Vercel v0 production audit doubles as a diligence pack: architecture diagram, six suggested ADRs, threat model, sub-processor list, SOC-2 readiness checklist, DPA template. Seed leads have read it on Friday and approved on Monday. Enterprise customers have used it to skip 70% of their security questionnaire. Full SOC-2 certification is a separate 8-12 week paperwork phase; we hand you the path.
Yes, before anything else. NDA signed inside 30 minutes via DocuSign, mutual template ready. We only need read-only repo access for the audit, never write access. Findings are encrypted at rest, accessible only to the four engineers on your project, and destroyed 90 days after handover unless you request a longer retention.
v0 is the builder. We’re an independent auditor. The audit you get from us is the one your acquirer’s CTO trusts, because it isn’t coming from the company that built the tool. v0’s own checks are useful inside the platform. Our pen test goes against your live app, the dependencies you imported, the integrations you wired in, and the deploy infrastructure you chose. Different angle, different findings.
In context
What it looks like shipped.
vercel v0 rescue, in context — the dashboards, flows and components your team actually ships, reviews and maintains.
Book the 5-day audit. NDA inside 30 minutes.
Tell us the Vercel v0 app URL, your seed timeline, and the customer you’d like to close next. Mohit replies inside 24 hours: a clear yes, a clear no, or the one question that decides it.
What happens after the email lands
- < 24h
A personal reply.
Yes, no, or the deciding question. Straight to your inbox.
- Mon
NDA + read-only access.
Signed in 30 minutes. Read-only repo access. The audit starts.
- Fri
30-page report.
Severity-ranked findings, sample code, and the fix list in GBP.