Security Best Practices for Modern SaaS Applications
Essential security patterns every SaaS team should implement from day one, from authentication to data encryption and beyond.
Security isn't a feature you add later — it's a foundation you build from the start. In this guide, we cover the essential security practices that every SaaS application should implement, regardless of size or stage.
Authentication Done Right
Use battle-tested authentication libraries instead of rolling your own. Implement multi-factor authentication, secure session management, and proper password hashing (bcrypt or Argon2). Never store passwords in plain text.
Encrypt Everything
Use TLS 1.3 for all data in transit. Encrypt sensitive data at rest using AES-256. Manage encryption keys with a dedicated key management service, not in your application code.
Implement Least Privilege
Every user, service, and API key should have the minimum permissions needed to function. Regular access reviews ensure that privileges don't accumulate over time.