Worked on the envoyproxy/envoy repository to optimize feature flag evaluation performance in C++. Focused on runtime configuration, this developer implemented a fast-path for the featureEnabled function under fractional percent logic, allowing early return when the numerator is greater than or equal to the denominator. By bypassing the modulo operation in cases where the feature is always enabled, the change reduced CPU overhead on the hot path and improved scalability for high-traffic deployments. The work centered on performance optimization and runtime configuration, delivering a targeted solution that aligns with the repository’s goals for efficient, dynamic feature gating in production environments.