TL;DR: A SaaS MVP doesn't need auth, email verification, billing integration, or a dashboard. It needs one core workflow that delivers value end-to-end. This guide covers the 7-day build sprint with TanStack Start, critical decisions for speed, and what to absolutely keep vs cut. For a more extended build timeline, see our Zero to MVP in 4 Weeks guide.
Introduction
The common excuse: "I need to build auth, set up billing, create a dashboard, design a landing page... my MVP will take months." This is wrong. Your MVP needs exactly one thing: a working version of your core value proposition. Before diving in, make sure you're building something people actually want — our SaaS Validating Ideas guide covers customer discovery techniques to validate demand first.
7-Day Sprint Plan
| Day | Focus | Deliverable |
|---|---|---|
| 1 | Setup + Core data model | TanStack Start project, D1 schema, deploy |
| 2 | Core workflow (read) | Main feature works with test data |
| 3 | Core workflow (write) | User can create/modify core entities |
| 4 | Landing page | Simple marketing page with value prop |
| 5 | Manual onboarding | Stripe payment link, manual user setup |
| 6 | Polish + testing | Fix critical bugs, test core flow |
| 7 | Launch | Share with first 10 users |
Deciding which features make it into the sprint and which get cut is the hardest part — our MVP Feature Selection Framework provides a systematic approach to prioritizing what to build first.
What to Cut
- Auth system → Use magic link or even no auth initially
- Email verification → Verify manually
- Team/collaboration → Single user only
- Admin dashboard → Direct database access
- Analytics → Manual check-ins
- Documentation → README only
- CI/CD → Manual deploy
Conclusion
A 7-day sprint forces you to identify what truly matters. If you can't ship something functional in 7 days, you either need to cut more scope or your idea is too complex for a solo founder MVP. Once you ship, the next critical step is validating that real users want your product — our Finding Product-Market Fit guide covers measuring engagement, retention, and the signals that confirm you're building something people need.