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Identity for B2B SaaS: what the product needs at each stage

The identity requirements of a B2B SaaS product as it grows: tenants and roles first, then session policy, audit, SSO and provisioning for enterprise deals.

The short answer

A B2B SaaS product needs tenant-aware identity from the first customer: users that belong to organizations, isolation between them, and administrators who can manage their own people. As customers grow, they add requirements — per-tenant session and password policy, audit trails, SSO with their identity provider, automated provisioning — and those arrive through security questionnaires rather than feature requests.

Sources last reviewed .

First customers

  • Tenants, memberships and roles.
  • Isolation you can explain in a security review.
  • Invitations and a first-administrator flow.
  • Sign-in with email and password or one-time codes, with sensible session lifetimes.

Mid-market customers

  • Per-tenant policy: session lifetimes, password rules, MFA requirements.
  • Session inventory and administrator revocation.
  • API access for the customer's own integrations — machine clients, not shared user passwords.

Enterprise customers

  • SAML or OIDC federation with their IdP, and SSO enforcement.
  • SCIM provisioning and deprovisioning.
  • Custom login domains and branding.
  • Evidence: audit logs, a security page, and honest answers about certifications.

In Authreads

How this applies to Authreads

Available today: hosted login, data-layer tenant isolation, per-tenant policy, session management and revocation, machine identity, tenant branding, passkeys and authenticator-app MFA. In progress: custom login domains. Planned: SAML, SCIM and fine-grained authorization. Authreads does not hold SOC 2 or other third-party certifications today.

Authreads is a multi-tenant identity platform in beta. Capability status is maintained on /roadmap as Available, In progress or Planned.

Sources

Keep reading

Multi-tenant architecture

Designing identity for a multi-tenant SaaS product

Multi-tenant architecture

B2B login flows: invitations, domains, SSO and the first admin

Protocols and how-tos

SAML SSO for B2B SaaS: what enterprise customers will ask for

Glossary: Multi-tenancy · Tenant isolation · Single sign-on (SSO) · SCIM

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