Build Log
How I Shipped a Full SaaS MVP in 6 Days — Stack, Decisions, and Lessons
A complete build log of shipping a production-grade SaaS MVP in under a week. Every stack decision, every shortcut, every lesson learned.
Day 1: Discovery & Architecture
The client needed a multi-tenant SaaS platform for managing fitness studios. I chose Next.js 16 + Supabase + Stripe. Here is why.
Stack Decision
Next.js for the frontend and API routes. Supabase for auth, database, and real-time subscriptions. Stripe for billing. Vercel for deployment. Total infrastructure cost: $0/month at launch scale.
Day 2-3: Core Features
Built the multi-tenant data model, auth flow, and dashboard shell. Used Supabase RLS for tenant isolation — zero custom middleware needed.
Day 4-5: Payments & Polish
Integrated Stripe subscriptions with webhook handlers. Added the billing portal, usage tracking, and email notifications via Resend.
Day 6: Deploy & Handoff
Production deployment on Vercel. Custom domain. SSL. Monitoring via Sentry. Full documentation and walkthrough recording delivered to client.
Key Takeaways
- Supabase RLS eliminates 80% of backend auth code
- Next.js App Router + Server Actions = no separate API needed
- Ship the core loop first, polish later
- Fixed scope = no scope creep = on-time delivery