Production Security Checklist for SaaS Apps: Auth, Authorization, and Data Isolation

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A developer guide from the Full Stack SaaS Masterclass series outlines the core security practices teams should implement before launching a multi-tenant SaaS application to production. On authentication, it recommends using bcrypt or argon2 for password hashing, keeping access tokens short-lived, and storing session tokens in httpOnly cookies rather than localStorage to prevent XSS-based session theft. Refresh token rotation with a token family mechanism is highlighted as an early investment worth making, since detecting and revoking compromised session chains becomes far harder to retrofit after a breach. For multi-tenant authorization, the guide stresses that tenant IDs must always be derived from the authenticated session rather than client-supplied inputs, as a missed organizationId filter in a database query can silently expose one tenant's data to another. Database-level controls such as Postgres row-level security are recommended as a backstop alongside application-layer checks, not as a replacement for them.

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