How to design an RBAC model for multi-tenant SaaS

When developing a multi-tenant SaaS product, implementing a flexible and maintainable role-based access control (RBAC) system becomes crucial, particularly after securing enterprise clients. Unlike single-tenant RBAC, where roles and permissions are straightforward, multi-tenant RBAC introduces scope, requiring authorization decisions to be tenant-aware. This complexity is compounded by the need for tenant-specific roles and the necessity to prevent data leaks through strict tenant isolation. Common models include global roles, tenant-scoped roles, and hybrid/role templates, each with trade-offs in flexibility, implementation cost, and enterprise readiness. Key challenges include avoiding role explosion, ensuring enforcement consistency, and maintaining performance through proper indexing and caching strategies. As enterprise needs grow, integrating with identity providers for group-to-role mapping and maintaining a coherent authorization story becomes essential. Solutions like WorkOS offer pre-wired tenant-aware RBAC components, allowing for scalable and compliant implementation without reinventing core access control mechanisms.