Identity federation lets systems share authentication across domains, platforms, and apps without storing passwords in every database. Instead of separate user silos, you have a single trusted identity source—often powered by protocols like SAML, OpenID Connect, or OAuth 2.0.
An MVP for identity federation focuses on essentials: one identity provider, a simple service provider, and secure token exchange. No custom code for every app, no manual user syncs. Build a functional workflow:
- User logs in once via the identity provider (IdP).
- IdP sends an assertion or token to the service provider (SP).
- SP verifies and grants access without another password.
Key components to design:
- IdP configuration with metadata and signing keys.
- SP integration to parse assertions or tokens.
- Session handling to keep users authenticated across services.
- Secure logout endpoints to end federated sessions cleanly.
Validation matters. Even for an MVP, enforce HTTPS, verify signatures, and limit token lifetimes. Test how the IdP handles edge cases—like expired sessions or invalid claims—before expanding to production scale.
Scaling beyond the MVP means supporting multiple IdPs, mapping attributes across different schemas, and connecting cloud, mobile, and on-prem apps. The architecture should remain protocol-first, not vendor-locked.
Identity federation MVPs are the bridge between proof of concept and enterprise rollout. Build the core once. Reuse it everywhere.
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