SaaS Application Development: Multitenancy Architecture

The Core of SaaS

Building a successful software-as-a-service product relies on SaaS Application Development that focuses on scalability and data isolation. The biggest architectural decision is how you store client data.

Single-Tenant vs Multi-Tenant

Single-Tenant: Every customer gets their own database and server instance. Highly secure (perfect for healthcare), but very expensive to scale and maintain.

Multi-Tenant: All customers share the same database and infrastructure, but their data is logically separated by a "Tenant ID". This is how Salesforce and Slack operate. It is highly cost-effective and easy to update.

Row-Level Security (RLS)

If you choose Multi-Tenant, implementing Row-Level Security in PostgreSQL ensures that a bug in your code cannot accidentally leak Customer A's data to Customer B.