How to use feature flags effectively

Short summary

A practical guide to using feature flags effectively, covering code organization (isolating flag logic vs nested if/else), assigning code owners to flags, testing the OFF mode, and cleaning up stale flags to reduce tech debt. Includes code examples for React components and recommendations for caching flags server-side and batching async calls to avoid render-blocking. The post also invites readers to share bug stories from flag-related production incidents.

• •Isolate flag logic in dedicated evaluators instead of nesting if/else in components
• •Assign code owners to every flag and automate cleanup alerts for stale flags
• •Cache flags per user server-side and batch calls to avoid blocking renders

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