Customer identity management solutions scale SaaS systems to 10M users

Enterprise customer identity and access management platforms enable B2B SaaS products to support large, multi-tenant organizations by embedding tenant identifiers, roles, and permission scopes in authenticated sessions and enforcing access boundaries at API gateways. They typically integrate federated SSO through SAML 2.0 or OpenID Connect, automate account lifecycle management through Just-in-Time provisioning and SCIM synchronization, and provide self-service administration for corporate IT teams. The text contrasts shared databases, schema-per-tenant, and database-per-tenant models in terms of performance, isolation, and scalability, while emphasizing that shared infrastructure with tenant-scoped controls can reduce cost. It also describes combining RBAC, ABAC, relationship-based permissions, and hierarchical policies for granular authorization; using scoped tokens for secure switching between multiple workspaces; and protecting sessions through token rotation, device and network context checks, TLS binding, and inactivity timeouts. Centralized immutable logs, rapid session revocation, and SIEM integrations are presented as important capabilities for meeting compliance obligations such as SOC 2, ISO 27001, and HIPAA.

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