Security Engineering

Overview

Build security in from the start, not bolt it on later. Covers authentication, authorization, input handling, and common vulnerability prevention.

Core principle: Trust nothing from outside your system boundary. Validate everything. Fail closed.

When to Use

• Setting up auth for a new project
• Adding role-based access control
• Handling user input
• Before deploying to production (security checklist)
• After review-code flags security issues

Authentication

JWT with Bearer Token