How to Build a SaaS MVP in 3 Weeks

The Challenge

Imagine you have a great SaaS idea, investors interested, and only 3-4 weeks before your demo day. You need an MVP — fast — but it has to be real enough to impress.

Here's the framework we use to ship MVPs in 3 weeks.

Week 1: Foundation

Spend the first 3 days on discovery:

Map out the core user flows (only 3 — be ruthless about scope)
Design high-fidelity screens in Figma
Set up the tech stack: Next.js, Supabase, Tailwind CSS

By day 5, you should have a working prototype with authentication and the core dashboard.

Week 2: Core Features

This is where the real building happens:

Build the primary value proposition feature
Implement real-time collaboration if needed (WebSocket-based)
Add the user management module
Integrate file uploads or third-party APIs

Week 3: Polish & Launch

The last week is all about making it production-ready:

Performance optimization (target 90+ Lighthouse score)
Mobile responsiveness
Error handling and edge cases
Deploy to Vercel with custom domain

Key Takeaways

Scope ruthlessly — An MVP doesn't need every feature, just the right ones

Design first — 2 days of design saves a week of rework

Use the right tools — Modern frameworks like Next.js and Supabase let small teams move fast

Communication is everything — Daily standups keep everyone aligned

Building a SaaS product? Let's talk about your MVP.