Adopt a B2B multi-tenant authentication architecture with an external identity provider as source of truth, URL-scoped tenants, SecurityV0 as its own organization, and cross-tenant super-admins via internal-org membership.
Select WorkOS as the identity provider for sv0-platform. Provides AuthKit (hosted login), enterprise SSO with self-serve Admin Portal, Directory Sync, and magic-link passwordless — free at evaluation scale, per-connection pricing at enterprise scale.
Research artifact: side-by-side comparison of six authentication providers (WorkOS, Clerk, Stytch B2B, Auth0, Cloudflare Access, roll-your-own) across twelve criteria. Informed ADR-017's selection of WorkOS.