Feature Flag Academy
A free, chapter-by-chapter guide to feature flags, written by the team that builds them. No fluff, no vendor pitch, no twelve-step funnel. Read it straight through, or jump to the chapter you need.
- Chapter 1
What is a Feature Flag?
The anatomy of a feature flag, the four jobs flags actually do, and why decoupling deploy from release is the single biggest unlock in modern delivery.
- Chapter 2
Architecture: Where Flags Live
Server, client, edge: how feature flag systems are actually built, what the trade-offs are, and why the hot path matters more than the dashboard.
- Chapter 3
Targeting and Rollouts
Rules, segments, percentage rollouts, and the sticky-bucketing trick that keeps the same user in the same variant, every time, on every device, forever.
- Chapter 4
Kill Switches and Incident Response
How to wrap your most dangerous dependencies in flags you can flip at 3am, and how to make the lever pullable by the person who's actually on call.
- Chapter 5
Experimentation vs Feature Flagging
When a flag becomes an A/B test, what changes the moment you start measuring, and the three patterns that look like experiments but really aren't.
- Chapter 6
Managing Flag Debt
Every flag is a debt. How to sunset the right ones at the right time, the half-life of a release flag, and the audit habits that keep a flag system from rotting.
- Chapter 7
Trunk-Based Development with Flags
Why long-lived branches are the wrong abstraction, how feature flags replace them, and the branch-by-abstraction pattern that lets you refactor anything live.
- Chapter 8
Feature Flags at the Edge
Why traditional flag architectures fall apart over distance, what changes when your app runs in 300 cities, and how edge-native systems hit sub-5ms evals from anywhere on the planet.
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