Early SaaS needs speed without painting the team into a corner. We favor a path that earns the right to complexity: NestJS for clear service boundaries, Stripe for billing that does not invent itself, and PostHog for product truth before vanity dashboards.
The goal is not a perfect stack on day one. It is a stack you can operate, observe, and evolve without a rewrite.
From first invoice to multi-tenant
Tenant isolation starts as disciplined data modeling and auth boundaries, then hardens into separate resources only when metrics demand it. Feature flags and usage events tell you when the MVP shape is lying, usually before the architecture does.
The goal is not a perfect stack on day one. It is a stack you can operate, observe, and evolve without a rewrite when the tenth customer asks for something the first never needed.
Where teams usually overbuild
Microservices before a clear domain boundary. Custom billing before Stripe’s model is exhausted. Dashboards before event schemas. We push teams to ship the boring path first and add seams only when PostHog and support tickets agree something is on fire.
