SaaS Security Best Practices: Auth, Authorization, and Data Protection

Short summary

Production SaaS security requires layered defenses: use OWASP-recommended Argon2id hashing with session rotation, HTTP-only cookies, and role-based authorization (RBAC/ABAC) with per-organization data isolation. Encrypt sensitive PII with AES-GCM before storage, enforce CSRF/rate-limiting, and set security headers (CSP, HSTS, X-Frame-Options). Provides production code examples using Better Auth, Drizzle ORM, Cloudflare D1, and TanStack Router.

• •Argon2id hashing with session rotation and HTTP-only cookies for authentication
• •Role-based and attribute-based authorization with per-organization data isolation
• •Encrypt PII with AES-GCM, enforce rate-limiting and CSRF defenses, set security headers

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