Feature Flags — Ship Code Without Shipping Features
Control which features are visible to users without redeploying, enabling gradual rollouts, A/B testing, and instant rollbacks.
Imagine you've been working on a major redesign of your checkout flow. It's taken three weeks. The code is ready, the tests pass, and it looks great in preview. You merge it, deploy it, and... users hate it. Conversions drop. Support tickets spike. You need to undo it, fast.
With traditional deployment, your options are ugly: revert the merge (losing three weeks of work from the git history), deploy a hotfix (hope you can code under pressure), or roll back to the previous deployment (which might also undo other changes that shipped since then).
With feature flags, you flip a switch. The new checkout flow disappears. The old one comes back. Users never notice. And your code is still there, in production, waiting until you're ready to try again — maybe with tweaks, maybe for a smaller aud
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