DField SolutionsMérnöki stúdió · Budapest
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CASE STUDIES · saas

B2B SaaS MVP · 0 → paying customer in 4 weeks

Scoped and shipped a B2B SaaS MVP for a Hungarian founder in 4 weeks. Multi-tenant RLS, Stripe Billing, Clerk auth, AI-powered core loop. First paying customer in week 5.

Timeline4 weeks
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Reviewed by
01 / First paying customerweek 5.
02 / Month 3€2,400 MRR, 18 paying seats.
03Zero data incidents · RLS held across 12 tenants.
04Founder reached the Series seed round on schedule.
The problem01 / 03
  • 01Founder had ~12 weeks of runway · MVP had to generate revenue signal before burn-out.
  • 02Initial scope from the founder was 10× what was shippable in 4 weeks.
  • 03Multi-tenant with enterprise-grade isolation couldn't be a 'later' · customers 2 + 3 asked immediately.
  • 04AI was the core differentiator · but it couldn't be a cost black hole.
The solution02 / 03
  • 01MVP scope worksheet · cut 7 of 10 proposed features, focused on 3 that resolved the target pain.
  • 02Postgres RLS from day 1 · tenant isolation baked in.
  • 03Stripe Billing with 3-tier pricing (free / pro / enterprise).
  • 04AI feature behind a daily credit budget · prevents runaway cost at bad-faith usage.
  • 05Clerk for auth · SSO ready for enterprise tier on day one.
The outcome03 / 03
  • 01First paying customer: week 5.
  • 02Month 3: €2,400 MRR, 18 paying seats.
  • 03Zero data incidents · RLS held across 12 tenants.
  • 04Founder reached the Series seed round on schedule.
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