Most discussions about security focus on tools: Authentication. Encryption. Firewalls. Compliance frameworks.
Those things matter. But underneath all of them sits a simpler question: Can users trust the system?
Security failures are rarely just technical failures. They're trust failures.
When customer data leaks, trust breaks. When authorization boundaries fail, trust breaks. When systems expose information they shouldn't, trust breaks.
The technical implementation matters because trust matters. That's why I increasingly think about security as a design discipline rather than a checklist.
Good security architecture assumes mistakes will happen. It assumes controls will fail. It assumes people will make errors. The goal isn't perfection. The goal is reducing the probability and impact of failure.
Layered defenses. Clear boundaries. Strong assumptions. Reliable defaults.
Security becomes much easier to reason about when viewed through the lens of trust. Because ultimately that's what customers are giving you: Trust.
Engineering's responsibility is protecting it.