James led a three-engineer team. They’d shipped a fintech MVP in eleven weeks, and Copilot wrote roughly 80% of it. Then the Series A diligence call came. The acquirer’s CTO opened the repo and asked basic questions. “Why are there four places that hash passwords?” “Why does the user object serialise three different ways?” The round was pushed.
Rescue GitHub Copilot code review · duplicate-code audit · consolidation · UK
GitHub Copilot code review for the codebase nobody. fully understands.
Did Copilot write 60 to 80% of your codebase? Get an independent code review and duplicate-code audit. We find the four versions of password hashing, the fourteen files named ‘helpers’, the secrets in Git history — then hand you a prioritised fix list, or consolidate on MERN + AWS. Your call.
14Copilot audits since 2024
23avgfindings per codebase
5-dayaudit window
Why founders book it
Your Copilot codebase shipped fast. Now find out what’s missing before someone else does.
An independent GitHub Copilot code review tells you what an LLM didn’t catch, ranked by severity, with effort estimates per fix. Fourteen audits in, every codebase had at least three critical findings.
“Why are there four places that hash passwords? Why does the user object serialise three different ways?”
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0
Independent GitHub Copilot audits delivered since 2024.
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0avg
Critical and high-severity findings per codebase.
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0-day
From signed NDA to a written report with a fix list.
The founder this page is for80% Copilot-written · round paused · reopened
James shipped in eleven weeks. The product was good. The diligence call went sideways.
The product wasn’t the problem. The codebase was. Copilot had doubled the team’s output, and it had doubled the surface area of code nobody fully understood. Fourteen utility files named ‘helpers’. Plaintext PII in logs. No rate limit on auth. No audit log. No DPA.
We ran the 5-day audit. Found twenty-three things, seven of them critical. James had the written report on day six. This page is for founders who’d rather know what’s in their GitHub Copilot codebase before the seed lead does.
THE FOUR WE SEE IN 80% OF CODEBASES
Four things we find in almost every Copilot audit
Patterns across fourteen independent audits. Copilot doubles a team’s output. It also doubles the surface area of code nobody fully understands.
Four versions of password hashing
Copilot suggested bcrypt, argon2, sha256, and pbkdf2 at different times. The repo has four implementations. Two of them are broken. Critical.
Fourteen files named ‘helpers’
Every suggestion landed in a new helpers.ts. After a year there are fourteen. Imports cross-reference each other. Tree-shaking is impossible. Critical.
No audit log on any mutation
Who changed what, when, and why? No record. The SOC-2 audit becomes a six-month panic when the first enterprise customer asks. Critical.
Secrets committed to the repo
A live Stripe, OpenAI, or SendGrid key in plain text in a .env file that’s in Git history. Git blame says “Copilot”. High.
The question on the left. What the audit tells you on the right.
Each one is the difference between guessing what’s in your Copilot codebase and knowing it in writing.
- 01
“I vibe-coded my Copilot app. Is the auth layer actually secure?”
OWASP-grade pen test plus auth review on day one. We try the attacks. RLS coverage tested. Anon-key fallback hunted. Session expiry verified. Pass or fail per OWASP category, with sample code per failure.
- 02
“I have 200 users. The seed deck says 50,000 by year two. Will the code survive?”
Load model and capacity number in the report. We model your app at 10× current traffic. What breaks first, what index is missing, what query times out. The capacity number lives in the runbook.
- 03
“My first enterprise customer sent a 60-page security questionnaire. I can’t answer most of it.”
SOC-2 readiness checklist, every control assessed. The audit ships the gap list: audit log, RBAC, encryption, MFA, change management. An 8 to 12 week path to ready. The questionnaire becomes two hours.
- 04
“One URL parameter could give one customer access to another’s data. We’ve never tested for it.”
Tenant isolation tested with the IDOR playbook. Insecure direct object reference tests on day one. Every customer-scoped endpoint, every URL parameter, every workspace boundary. Findings ranked by severity.
- 05
“I want to hire a senior engineer. They’ll open the codebase and refuse the offer.”
Code quality report, suggested ADRs, onboarding gap list. The duplicate-code audit counts the patterns. Dead code mapped. Suggested ADRs drafted. Your senior reads the audit and the codebase together.
- 06
“I need to know what fixing the findings will cost in GBP and weeks before I commit.”
Effort estimate per finding, in GBP and engineering days. The report lines up each finding with effort. £X to fix in Y days. You decide: in-house, us, or a hybrid. No commitment to use us for the fix.
- 07
“I’m raising in six months. What will the acquirer’s CTO find on the diligence call?”
Diligence-ready architecture brief plus ADR pack. The audit doubles as a diligence pack. Architecture diagram, six ADRs, threat model, sub-processor list. The acquirer’s CTO walks through it without flinching.
- 08
“I want to keep iterating in Copilot. The audit is to find out what NOT to vibe-code.”
What to keep in Copilot, what to harden outside it. UI iteration stays in Copilot. Auth, billing, tenancy, and observability move to a hardened spine. You keep your speed. You lose the risk.
Results
James’s Copilot codebase,
James’s Copilot codebase,
after consolidation, in numbers
A 5-day audit found 23 issues, seven critical. James consolidated with us across nine weeks: one password-hashing path, one helpers module, indexes where they belonged, an audit log on every mutation.
Codebase
95K38K
Lines after duplicate-code consolidation
1284%
Test coverage
Findings
23
Issues found, 7 critical resolved
6
ADRs the next CTO inherits
Track record
14
Copilot audits since 2024
100%
Delivered in 5 days
GitHub Copilot code review · the 5-day window
What the audit covers
Same shape every audit. NDA Monday morning. Written report Friday afternoon. Open any row.
DAY 1
(01)
Security assessment
OWASP Top-10 penetration test against your live Copilot app. Auth review: sessions, tokens, RLS, anon-key handling. Dependency audit. Secret scanning across the repo and Git history.
OWASP pen test
Auth + RLS
Dependency audit
Secret scanning
Security assessment
DAY 2
(02)
Architecture review
Schema review: foreign keys, indexes, multi-tenant boundaries. Data-flow diagram. State-management audit. Webhook reliability check. Load and scale model at 10× current traffic.
Schema review
Data-flow diagram
State audit
Load model 10×
Architecture review
DAY 3
(03)
Code quality + duplicate-code audit
Static analysis. The AI code duplication audit: every copy of the same logic counted and mapped. Dead-code map. Test coverage report. Logging and observability audit. CI/CD pipeline review.
Duplicate-code map
Dead-code map
Test coverage
CI/CD review
Code quality + duplicate-code audit
DAY 4-5
(04)
Compliance + written report
SOC-2 readiness checklist. UK GDPR data handling. DPA template plus sub-processor list. A 30-page written report with a severity-ranked fix list, sample code, and effort estimates in GBP and engineering days.
SOC-2 checklist
UK GDPR + DPA
30-page report
Effort in GBP
Compliance + written report
Three ways to start. The audit fee is fixed.
Everything past the audit is line-itemed. You decide on day six. No commitment to fix with us.
5-day audit
£8K fixed. A 30-page written report. You walk away with it whatever you decide next.
- OWASP-grade pen test
- Architecture + scale model
- SOC-2 + DPA pack
- No commitment to fix with us
Fix sprint
£12K to £30K total. We fix the critical findings. You keep Copilot for the rest.
- Audit plus four critical fixes
- Idempotent billing
- Auth + RLS hardened
- Audit log on every mutation
Rebuild
£28K to £60K total. Consolidation on MERN + AWS. Same UI, one defensible spine.
- 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 14 GitHub Copilot audits, every codebase had at least three critical findings: an auth gap, a billing race condition, a tenant-isolation hole, or a missing audit log. Copilot is a brilliant builder. It’s not a security platform. The 5-day GitHub Copilot code review 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 audit 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 pen test against your live Copilot app. Architecture review. A load model at 10× current traffic. SOC-2 readiness checklist. UK GDPR plus DPA pack. The duplicate-code audit. A 30-page written report with severity-ranked findings, sample code, and effort estimates in GBP and engineering days. You can walk away after the audit. Most founders don’t, but the option is real.
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 consolidation. All three paths are fine. You decide on day six.
For most cases, yes. The GitHub Copilot code review 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 to 12 week paperwork phase; we hand you the path.
Yes, before anything else. NDA signed inside 30 minutes via DocuSign. Mutual NDA template ready. We only need read-only repo access for the audit, never write access. Findings are encrypted at rest, accessible only to the engineers on your project, and destroyed 90 days after handover unless you request a longer retention.
Copilot 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. 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.
That’s the best time to book it. Founders who run the audit before the diligence call walk into the meeting with the report in hand. Round timelines shorten. The seed lead asks for the audit and you already have it. That’s the conversation we want you to have.
In context
See it in context.
A look at the kind of github copilot rescue surface we hand over — real screens, real data, documented and yours from day one.
One paragraph. That’s it.
Tell us the Copilot 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. The audit starts that morning.
- Fri
30-page report.
Severity-ranked findings, sample code, effort in GBP and days.