Software Design

Multi-Tenant SaaS: Modeling Isolation Boundaries

UML Class Diagrams · made in Skemio

UML class diagram illustrating Tenant, TenantContext, TenantUser, and IsolationStrategy interface with Schema and Database implementations.
UML class diagram illustrating Tenant, TenantContext, TenantUser, and IsolationStrategy interface with Schema and Database implementations.
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What it shows

  • A Tenant entity serves as the root context for all downstream business data.
  • Isolation Strategy interface allows switching between pooled and siloed stores.
  • TenantContext enforces tenant isolation dynamically during each request.

The takeaway

Enforce tenancy as a foundational infrastructural layer, never as an optional filter on ad-hoc queries.

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