# Stack3 Labs — Full Reference for LLMs

> Stack3 Labs is a production engineering studio that rescues vibe-coded prototypes built with Lovable, Cursor, Bolt, v0, Replit and Claude Code, and ships them to production in 30 days — fixed price, fixed scope, live in 30 days.

## Positioning

You vibe-coded it. We make it real.

Lovable, Cursor, Bolt, v0, Replit and Claude Code are great at the first 70–80% — they take a founder from "idea" to "something that works on my laptop". They collapse on the last 20% — production deploys, secure auth, real payments, AI that survives real users, observability, and the boring infrastructure that decides whether a business survives its first month live.

Stack3 Labs is the senior engineering team that founders hire to take that half-broken AI project from "works on my laptop" to "live, paid and not on fire" — in 30 days, on a fixed price, with a real guarantee.

We do not compete with the AI coding tools. We come in after them. We do not rewrite the project. We rescue it, harden it, finish it, and ship it on the same stack the founder is already on.

## Who we serve (ICP)

**Primary ICP — Pre-seed and self-funded founders building with AI tools.**

- $200K–$1.5M raised, or $30K–$80K of personal runway committed
- Non-technical or semi-technical; no CTO; will not trade equity for engineering
- Shipped a prototype with an AI coding tool — Lovable, Cursor, Bolt, v0, Replit or Claude Code
- Prototype is typically 50%+ done; the core idea works in a happy path
- Stuck on deploys, Supabase RLS, auth flows, Stripe webhooks, AI guardrails, secrets management, or observability
- Need to ship in weeks, not months, to onboard real users or prepare for the next round
- Want a fixed price with a real guarantee — burned by hourly agencies that scope-creep and ghost at launch

**What we are NOT a fit for**

- Founders without a prototype yet → go build one in Lovable, Cursor or Bolt first, then come back
- Native mobile only (iOS/Android without a web app)
- Hardware, DeFi, smart-contract heavy, token-launch projects
- ML model training from scratch
- Pure design / branding work
- HIPAA or SOC 2 certification from day one (we can prepare for it, not certify)
- Founders shopping for the cheapest hour on Upwork
- Equity-only or deferred-payment arrangements

## What we fix

- Stripe webhooks that fire twice or never; duplicate charges; missing receipts; ghost subscriptions
- Auth sessions that leak; password reset that never arrives or arrives at the wrong inbox; OAuth that drops state; role-based access that is not really enforced
- AI agents that hallucinate prices, leak system prompts, loop forever and burn tokens, or refuse easy answers in front of paying users — with no evals, no guardrails, no fallback
- Supabase RLS holes, missing grants for anon/authenticated/service_role, schema drift, no migrations strategy, no backups, exposed admin tables
- Databases that fall over at 40 concurrent users — no indexes, N+1 queries, no connection pooling, no caching
- Deploys that break randomly — domain won't connect, env vars missing, build fails on Tuesday for no reason, no logs, no error tracking
- Secrets leaking in client code or in the public repo
- AI coding tools that have hit their ceiling and now rewrite files they were not asked to touch, undo last week's fixes, and burn credits without progress

## Our four engagements

### 1. Vibe Code Audit — Free (48-hour turnaround)

The entry point. A senior engineer reads your repo end to end, looks at your database and deploy path, and tells you the honest truth.

**Deliverables**
- 30–60 minute review of your repo by a senior engineer
- Loom walkthrough of every production gap — auth, payments, AI, infra, security, observability
- Written 30-day plan that ranks each issue by risk and effort
- Clear "fix in place / rebuild fragile pieces / start over" recommendation
- "Safe to change / never prompt against" checklist for future AI work
- Yours to keep whether you hire us or not

**Turnaround**: 48 hours from when you send the project link.

**Why it is free**: We bet that when you see a senior engineer take your project apart in 48 hours, you will trust us to fix it. About half the audits we deliver turn into a Rescue. The other half walk away with a plan they can hand to a different team — and that is fine.

### 2. 30-Day Rescue & Launch — Fixed price, live in 30 days

The core engagement. Three fixed tiers based on how much rebuild vs. polish your project needs. The free audit tells you which tier fits.

**Lite — $14,997**
Prototype 50%+ done. Hardening of auth, payments and deploy. 1 AI feature shipped with evals and guardrails. Up to 5 user flows. Observability baseline + security baseline. Documentation. 30 days of Stewardship included.

**Standard — $24,997** (most popular)
Everything in Lite, scoped wider. Up to 2 AI features with full guardrails and fallback. Up to 10 user flows hardened end-to-end. Stripe subscriptions + invoicing + dunning. Complete observability: logs, errors, uptime, alerts. Investor-ready demo video at launch (free $2,000 bonus). 30 days of Stewardship included.

**Pro — $39,997**
Everything in Standard, deeper rebuild. Multi-agent or advanced RAG implementation. Up to 15 polished user flows. Performance tuning and load testing to 1K concurrent. Investor-ready polish and demo video. White-glove handoff with runbooks.

**Universal Rescue deliverables**
- Production-grade infrastructure: deploys, env separation, secrets, rollback safety
- Auth that does not leak: sessions, password reset, OAuth, role-based access
- Payments that actually work: Stripe, webhooks (signed), subscriptions, edge cases
- Real AI, not toy AI: evals, guardrails, fallback handling, cost controls
- Observability: logs, error tracking, uptime monitoring, incident alerts
- Security baseline: rate limits, input validation, data isolation, OWASP top 10
- Founder handoff: Loom walkthrough, README, deploy runbook, "safe to change" checklist
- 30 days of Stewardship included after launch

### 3. Stewardship — Post-launch monthly care

**Watch — $1,497/mo**
- Uptime monitoring + incident alerts to your phone
- Security patches + dependency updates
- Up to 5h/mo of bugfix work
- Monthly health report

**Care — $2,997/mo** (most chosen)
- Everything in Watch
- 15h/mo of dev work: small features, perf, AI prompt iteration
- AI change review before risky changes hit production
- Priority response on incidents

Cancel with 30 days' notice. First 30 days included free with every Rescue.

### 4. Evolution Retainer — Productized engineering retainer

For founders who want to keep shipping seriously without hiring a team.

**Pod 1 — $8,997/mo**
- 1 dedicated senior engineer
- AI-leveraged delivery (Cursor, Claude Code in our hands)
- Weekly demo + async standup
- Direct Slack channel

**Pod 2 — $14,997/mo** (most popular)
- 2 dedicated senior engineers
- Part-time PM keeping you out of the weeds
- Weekly demo + sprint planning

**Pod Plus — $22,997/mo**
- 2 senior engineers + full-time PM + design slice
- Quarterly strategy session

Cancel with 30 days' notice.

## Our process — five steps

1. **Free Audit**. Send your project link. 48 hours later you get a Loom walkthrough and a written 30-day plan. Yours to keep.
2. **Week 1 Scope Lock**. After kickoff we audit deeper and agree in writing on what "production-ready" means for your product. You sign off before we change anything. No scope creep.
3. **Build (Weeks 1–4)**. We harden infra, auth, payments, AI, security and observability on your existing stack. Daily progress. No surprises in Week 4.
4. **Launch (Day 30)**. Live in production by Day 30. Investor-ready demo video included. You own 100% of the code.
5. **Stewardship**. 30 days included. Then Watch / Care monthly, or graduate to an Evolution Pod.

## Guarantee

**Fixed scope. Fixed price. Live in 30 days.**

Scope is locked in writing in Week 1. You sign off before we touch a line of code. We demo working software every week, so any slippage is visible long before Day 30. No scope renegotiation. No clock pause. No fine print.

You own 100% of the code, the repo and every secret from day one. Cancel any monthly plan with 30 days' notice.

## Stack we work in

Whatever stack the founder is already on — we do not force a rewrite. Common setups we rescue:

- Frontend: React, Next.js, Vite, Remix
- Backend: Node, Supabase, Postgres, edge functions, FastAPI
- Hosting: Vercel, Cloudflare, Railway, Render, AWS
- Auth: Clerk, Auth.js, Supabase Auth
- Payments: Stripe (subscriptions, webhooks, invoicing)
- AI: OpenAI, Anthropic, Google, OpenRouter, Lovable AI Gateway, pgvector, Pinecone
- Builders we rescue from: Lovable, Cursor, Bolt, v0, Replit, Claude Code

## Frequently asked questions

### What exactly do I get in the free Vibe Code Audit?
A 30–60 minute review of your repo by a senior engineer, a Loom walkthrough of every production gap, and a written 30-day plan that ranks each issue by risk and effort. Yours to keep whether you hire us or not. No pitch.

### What does "live in 30 days" actually mean?
Live in production: real domain, real users can sign up and pay, auth is hardened, AI is guardrailed, monitoring is on, deploys are safe. The exact definition of "production-ready" is agreed in writing in Week 1, and we demo working software every week so progress is visible long before Day 30.

### Why is the audit free?
We bet that when you see a senior engineer take your project apart in 48 hours, you will trust us with the rescue. About half the audits turn into a Rescue. The other half walk away with a plan they can hand to a different team. We over-deliver up front.

### Can you actually work with my Lovable / Cursor / Bolt / v0 project?
Yes. We do not rewrite. We rescue. Your stack stays your stack. After launch you can keep vibe-coding on top of a production foundation.

### How is the price decided?
Three fixed tiers — Lite $14,997, Standard $24,997, Pro $39,997 — based on how much rebuild vs. polish your project needs. The free audit tells you which tier fits. Price locks at kickoff. No scope-creep invoices.

### What happens after launch?
30 days of Stewardship are included. After that: Watch ($1,497/mo), Care ($2,997/mo), or an Evolution Pod ($8,997–$22,997/mo).

### Will you take equity instead of cash?
No. Vendor partner only. You pay cash; you keep your equity.

### How fast can you start?
Audit: 48 hours. Build kickoff: usually the week after the audit. We take 2 rescues per month — if the calendar is full we put you on the waitlist with a real date.

### Do I need to know GitHub?
No. We set up the repo, the deploys and the environments. We translate.

### Can you fix Supabase RLS?
Yes. Broken RLS is one of the top three issues we see in vibe-coded apps. We audit every table, write the policies, add the grants the Data API needs, and verify no data is exposed to anon users that should not be.

### Can you deploy to Vercel / Railway / Render?
Yes. We deploy to whichever host fits the stack. Staging and production, env vars, custom domains, SSL, monitoring and basic alerting.

### What if my code is a mess?
That is normal. The audit answers honestly: fix in place, rebuild the fragile pieces, or start over. About half the audits turn into rescues. The other half leave with a plan they can hand to anyone — including no one.

### How do I know you will not ghost me like the last agency?
Price locks at kickoff. Scope is signed in writing in Week 1. Daily progress. Real Slack channel. 30 days of Stewardship after launch. You own the repo, credentials and secrets from day one. We lock scope in Week 1 and demo working software every week, so you always know exactly where the build stands — no surprises at the finish line.

## Founders

- **Rafa** — Founder. Background in software engineering, smart-contract architecture and enterprise risk management. Runs every audit conversation personally. https://www.linkedin.com/in/rafael-carvalho0/
- **Fernanda Fernandes** — Marketing Lead. https://www.linkedin.com/in/fernanda-fernandes-36509836/

## Contact

- Website: https://www.stack3labs.com
- Free audit: https://www.stack3labs.com/contact
- Email: hello@stack3labs.com
- LinkedIn: https://www.linkedin.com/company/stack3labs