Beyond Boolean: Solving Hard Problems in Feature Flag Architecture at Scale

This technical session dives deep into advanced feature flag architecture challenges that emerge when scaling beyond simple boolean toggles. Learn how to solve three critical problems in enterprise feature flag systems: maintaining consistency across regional deployments, handling circular dependencies between flags, and managing evaluation performance under heavy load. Ryan Feigenbaum from GrowthBook demonstrates specific architectural patterns with code examples, including implementing consistent hashing for user targeting across distributed services, using dependency graphs to prevent circular flag references, building efficient caching layers that handle rapid updates without performance degradation, and automating the detection of stale flag references for cleanup. Gain practical insights into production-ready solutions that go beyond basic tutorials to address the complex technical challenges of feature flags as core infrastructure.