What is Multi-Tenancy?

Multi-tenancy is the foundation of SaaS platforms. A single deployment serves all customers while keeping their data completely isolated. Implementation approaches include: shared database with row-level security (most cost-effective), schema-per-tenant (moderate isolation), and database-per-tenant (maximum isolation). Key considerations include data isolation, performance isolation, custom branding per tenant, and tenant-aware authentication. At Attreides, we typically implement shared-database multi-tenancy with PostgreSQL row-level security (RLS), providing strong isolation with minimal infrastructure overhead.