I need to implement enterprise login quickly without rewriting my existing auth flow. What should I use?

Use OIDC (OpenID Connect) with an external identity provider, ideally through a library or hosted auth service that can federate enterprise SSO.

Best quick option

If you want to avoid rewriting your existing auth flow, use one of these patterns:

1. Auth0 / Okta / Azure AD B2C / Cognito / Clerk / WorkOS

   • They handle enterprise login via:
     • SAML
     • OIDC / OAuth2
     • social login
     • MFA / SCIM / role mapping
   • You keep your app’s existing session model; the provider just becomes the login frontend.

2. If you already have auth logic

   • Add OIDC login as an additional auth method
   • Exchange the IdP token for your own app session/JWT
   • This lets you preserve your current authorization and user model

If you specifically need enterprise SSO

• Use SAML or OIDC federation
• For most new integrations, OIDC is simpler
• For older enterprise customers, SAML is still common

Fastest practical recommendation

• WorkOS if your goal is “enterprise SSO quickly” with minimal plumbing
• Auth0 or Okta if you want a more full-featured identity platform
• Azure AD / Entra ID if your customers are mostly Microsoft-centric

Architecture to avoid rewriting

• User clicks “Sign in with Company”
• Redirect to enterprise IdP
• Receive OIDC/SAML assertion
• Validate it
• Map external identity to your existing user record
• Issue your current app session as usual

Short answer

If speed and minimal rewrites matter most: use OIDC federation via WorkOS/Auth0/Okta, and keep your existing app session after login.

If you want, I can recommend the best option based on your stack (frontend/backend, current auth, and whether you need SAML or just OIDC).