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Architecture
Multi-Tenant SaaS Architecture: What Actually Works
SSO, tenant isolation, and shared infrastructure — practical patterns from platforms serving hundreds of users across multiple modules.
8 min read
Multi-tenancy fails when isolation is an afterthought. We prefer a single database with tenant_id scoping on every query, enforced at the ORM middleware layer — not left to each developer to remember.
SSO across modules (as in the Dastorino suite) requires a central auth service, short-lived tokens, and consistent session revocation. Shared UI components reduce drift; shared API contracts reduce integration bugs.
Operational maturity matters: per-tenant rate limits, structured logging with tenant context, and backup strategies that can restore one customer without taking down the fleet.