May 26, 2026 · 5 min read
Building PhysioFlow: The 9 Layers Behind a Production-Grade SaaS, Shipped Solo
A behind-the-scenes look at building PhysioFlow — a multi-tenant physiotherapy clinic platform for the Indian market, shipped solo, in public. The 9 layers between a form submit and a patient's record, the architecture decisions that actually mattered (RLS as the tenant boundary, append-only GST billing, webhook-as-source-of-truth), and what 218 tests really bought.
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