Why do teams use feature flags? Because "move fast and break things" is only fun until you break prod. Feature flags let you move fast and break things slightly less dramatically. Here’s how real engineering teams actually use them. Canary Releases A canary release means you roll out a change to a small percentage of users first—say, 1%—before exposing it to everyone. If the 1% starts screaming, you flip the flag off and investigate. If they don't notice anything...