I’m sick of $200 SaaS boilerplates that leak tenant data. Here is how to build real isolation.

I’m sick of "SaaS boilerplates" that charge you $200 just to wrap a framework and leave you to figure out multi-tenant database isolation yourself when your first enterprise customer signs up. Most templates start clean, but turn into this within a month. Your if (user.orgId === req.body.orgId) checks are going to leak data eventually. It's just a matter of time. You don't need "magic" hidden in node_modules. You need an explicit, boring, production-grade foundation. I got tired of rebuilding the same complex isolation architecture, so I built FlowStack. Today, I’m open-sourcing the organization-v2 branch. No paywalls. No games. 🏗️ Why "Boring" Architecture Wins When you are building a B2B SaaS, your architecture needs to respect strict boundaries. FlowStack is built as a Turborepo monorepo to enforce this separation physically, not just logically. apps/server (The API) apps/web (The Client) packages/auth (Identity & Isolation) packages/db (Type-safe Postgres Schemas) If a package