In Audit Logs You Can Trust, we built a system that answers "who changed what, and when." Feature flags answer a related question: "who gets to see this, and how much of it." Once you trust your audit trail, the natural next step is controlling what actually ships behind it. A flag toggle is exactly the kind of change your audit log should be recording.
This is part of the Full Stack SaaS Masterclass, a build-it-for-real series that takes a multi-tenant SaaS from an empty repo to production. We're deep into Module 4 now: the unglamorous plumbing that separates a demo from something you can run a business on.
Feature flags get a bad reputation because teams either skip them and ship risky all-or-nothing deploys, or bolt on a full experimentation platform before they have a single paying customer. What you actually need, most of the time, is much simpler than either extreme.
Why feature flags earn their place
The core problem a flag solves is decoupling deployment from release. Without flags, "merge to main" and "customers see this" are the same event. That's fine until it isn't: a half-finished billing rewrite sits in a long-lived branch for weeks, and the eventual merge is a nerve-wracking event instead of a routine one.
