That was when I realized access control is never a one-time check. Authorization that stops at login is broken. Real security demands something else: continuous authorization.
Traditional access systems work like a door key — once you have it, you can roam free. Continuous authorization is different. It keeps verifying every request, every session, every action against fresh, real-time data. It answers the most critical question at any given moment: should this user still have this level of access right now?
With microservices, APIs, and distributed systems, trust is brittle. A token might be valid, but the role behind it may have changed. A policy in the database might be updated mid-session. A privilege might be revoked before the token expires. Without continuous checks, a gap forms between reality and enforcement — and that gap is risk.
The heartbeat of continuous authorization is policy evaluation at runtime. Every request passes through a gate that checks who the user is, what they’re trying to do, where they’re coming from, and the system’s current state. It works with zero trust architecture. It prevents privilege creep. It turns authorization from a one-off event into a living, breathing process.