OIDC, OAuth 2.0 & Okta (Enterprise Identity)
Definition
OAuth 2.0 is the standard protocol for delegated authorization; OpenID Connect (OIDC) is an identity layer on top of it that adds authentication — a signed ID token describing who the user is. Okta (and Microsoft Entra ID) are the dominant enterprise identity providers (IdPs) implementing these standards, giving companies single sign-on (SSO), multi-factor auth, and user lifecycle management across all their applications.
Why it matters for AI jobs
Every enterprise deal starts with "does it support SSO with our IdP?" — AI products included. Engineers on B2B AI products constantly integrate OIDC login, validate JWTs in APIs, map IdP groups to roles, and implement SCIM for automated user provisioning. Job posts listing "Okta/OIDC" want engineers who can own this integration end to end, including its security pitfalls.
Key concepts
- OAuth roles — resource owner, client, authorization server, resource server.
- Authorization code flow + PKCE — the correct flow for web and native apps today.
- ID token vs access token vs refresh token — purpose, audience, and lifetime of each.
- JWT validation — signature (JWKS), issuer, audience, expiry; common mistakes.
- SSO & federation — OIDC and SAML from an IdP like Okta or Entra ID; Just-in-Time user creation.
- SCIM — automated provisioning/deprovisioning of users and groups.
- Authorization models — RBAC vs ABAC; mapping IdP groups/claims to application roles.
Learning path
- Get a free Okta developer account and wire OIDC login into a small app by hand (no SDK) to learn the redirects and tokens.
- Protect a FastAPI or Node API with JWT validation against Okta’s JWKS endpoint.
- Add role-based authorization from token claims/groups; test tampering and expiry failures.
- Implement a minimal SCIM endpoint or use Okta’s SCIM test harness to understand provisioning.
- Read the OAuth 2.0 Security Best Current Practice (BCP) and be able to explain the top attacks (token leakage, CSRF, mix-up).