Vibe Coding

Most teams can make login work. Few can make it stay correct.
This book is a workflow-first playbook for building authentication and authorization in a small web app that expects real users, real devices, and real pressure. You will build PocketOrgs, a compact multi-org app that forces the real questions early: tenant boundaries, roles that rot into exceptions, sessions that behave strangely across tabs and devices, and recovery flows that help users but also attract attackers.
You will not get a theory-heavy security lecture. You will get a calm, implementable system with rails you can test and operate.
Inside, you will build and prove:
Identity vs authorization on purpose, with org membership as the source of truthCookie-based sessions with a real lifecycle: rotation, revocation, and device listPasskeys as a first-class login method, plus email and OAuth with PKCE done safelyRecovery designed as an attacker flow, with one-time challenges and strict rate limitsCentralized authorization via a policy layer that returns reasons, not vibesTests that prevent regressions, including browser reality tests and auth chaos checksOperational truth: audit trail, retention intent, runbooks, and a handoff packageSecrets hygiene and non-human identities so machine access does not become a backdoor
If you are shipping a real product without a security team, this is the book that keeps auth from becoming your most expensive feature.

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