Multi-tenant SaaS architecture patterns

Short summary

A practical guide to multi-tenant SaaS architecture covering row-level, schema-per-tenant, and database-per-tenant isolation patterns. Row-level multi-tenancy with PostgreSQL Row-Level Security is recommended as the default for most B2B SaaS products, with deliberate escalation to dedicated databases only for regulatory or noisy-neighbor reasons. Key advice: bake tenant_id into every table, enforce isolation at the database layer, and centralize tenant provisioning.

• •Row-level multi-tenancy with PostgreSQL RLS is the right default for most B2B SaaS
• •Escalate to schema-per-tenant or database-per-tenant only for regulatory or scale reasons
• •Write RLS policies so helper functions run once per query, not once per row

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