The original title is a technical article title about building an IAM service. Let me rewrite it as a news headline for a mobile feed.

Short summary

AuthCore demonstrates production-grade IAM with FastAPI, implementing refresh token families to prevent replay attacks, TOTP-based MFA with challenge tokens that separate password verification from full authentication, and RBAC via role-permission bindings. The system enforces audit logging at critical points—even before raising exceptions—ensuring security events are never lost. Coverage includes token lifecycle, session management, concurrent session limits, rate limiting, and the architectural choices that distinguish production systems from typical JWT tutorials.

• •Refresh token families with single-active-token validation prevent replay attacks by revoking entire family on reuse
• •MFA flow separates password verification from token issuance via short-lived challenge tokens, blocking bypass attempts
• •Audit events are explicitly committed before exceptions to preserve security evidence even on rollback

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