How to Deploy 10 Times a Day Safely with Feature Flags
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Feature flags decouple deployment from release, enabling backend teams to safely merge and deploy code to production multiple times a day without exposing unfinished features to users. The post covers practical implementation with user-context-aware flag evaluation, the Expand and Contract pattern for safe database migrations, canary rollout strategies (1% → 10% → 50% → 100%), and the critical discipline of treating flags as temporary scaffolding with assigned owners and short lifespans. Tool recommendations include LaunchDarkly, Flagsmith, and Unleash, with a key architectural note that flag evaluation must resolve in-memory to avoid blocking production paths.
