Multi-Tenancy Patterns

Overview

Multi-tenant systems serve multiple customers (tenants) from a single deployment while keeping their data and configuration isolated. The hard part is not handling one tenant — it is ensuring that tenant A can never read, write, or affect tenant B's data, even when they share the same database, cache, and application servers.

When to use: Designing SaaS platforms; reviewing any code that queries a shared database; evaluating caching layers; building onboarding or offboarding workflows; assessing the blast radius of a bug that touches tenant data.

Quick Reference