15 mins
Authentication & Authorization in Production
Authentication and authorization aren’t “login features”—they’re a production system shaped by browser behavior, protocols, and real attack paths. This guide cuts through the misleading “sessions vs tokens” debate and instead explains what actually matters: stateful vs stateless validation, OAuth 2.0 vs OIDC, SSO and federation, and how to design permissions that don’t leak data across tenants. You’ll see practical patterns (BFF + API), common Auth0 integration pitfalls, a threat-driven defense checklist (XSS, CSRF, token replay, refresh rotation, key rotation)