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Vertical

B2B SaaS

The job identity does in this industry

In B2B SaaS, identity is a product surface. The same screen that handles signup is the screen where deals close — an SSO checkbox can be the difference between a $50K and $500K contract.

Use cases by segment

  • Early-stage startup: Email + password + Google OAuth. Worry about SSO later.
  • Growth-stage SaaS: SSO enablement becomes mandatory for any deal above mid-market. SCIM provisioning, audit logs, custom domain.
  • Mature enterprise SaaS: Multi-tenancy with org hierarchy, fine-grained permissions per workspace, SCIM with attribute mapping, certified compliance.

Vendor landscape

The category is dominated by developer-led platforms: Auth0 for breadth, Clerk for React-first experience, Frontegg for B2B multi-tenant patterns, Stytch and Descope for passwordless-first flows. WorkOS is the specialist for the "enterprise readiness" tier — SSO + SCIM + audit logs as primitives. Kinde bundles auth with adjacent product primitives.

Capability requirements

Tenant data model with organizations and users (many-to-many). SSO via SAML and OIDC. SCIM for provisioning. Custom domains for branding. Audit log API for customer SIEM. Webhooks for org and user events. Fine-grained authorization model that scales to per-document, per-record access.

Common pitfalls

  • Building auth on a stack that can't be migrated when you outgrow it
  • Treating organizations as a bolt-on to users instead of a first-class tenant model
  • Storing customer-specific SSO configurations in code instead of as data
  • Skipping SCIM because "JIT provisioning works fine" — until the customer asks for offboarding within 24 hours
  • Building custom authorization that you can't audit when the SOC 2 assessor arrives

Outlook

Passkey adoption in B2B is faster than expected — admins are easier to push toward strong authentication than consumers. Fine-grained authorization (ReBAC) moves from niche to expected. Expect more buyers to require AI agent identity controls as customers deploy agents that act on their behalf.