Greta Hoffmann
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B2B SaaS MVP in 11 days
Built a niche CRM for fitness coaches — full auth, billing, dashboard, mobile-responsive. Stack: Next.js + Supabase + Stripe.
Founder closed 8 paying clients in the first month.
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Problem
Founder had eight pre-orders for a fitness-coach CRM but no product. Hiring a dev shop quoted 12 weeks and €60k. They needed to ship in two weeks.
Users
Public SaaS — 30+ paying fitness coaches across UK and DE
Key flow
- 1Coach signs up, adds clients and assigns a training program
- 2Clients receive a check-in link each week and log progress
- 3Coach reviews on mobile, sends adjustments inside the app
What I built
- Next.js app on Vercel with magic-link auth via Supabase
- Client + program + check-in models with per-coach data isolation
- Stripe Checkout + customer portal for self-serve billing
- Mobile-first UI — coaches use it on phones between sessions
Limits
- Single-coach accounts only — multi-coach team plans queued for v2
- Reporting is basic — exports CSV, no built-in charts yet
AI tools used
- Cursor
- Vercel
- Supabase
@greta.hoffmann