Worked on Unleash/unleash-client-java and Unleash/yggdrasil repositories to deliver reliability, observability, and performance improvements using Java, Rust, and YAML. Simplified the CI/CD pipeline by removing Slack notifications from GitHub Actions, reducing external dependencies and streamlining deployment. Enhanced client metrics by introducing a default fetch interval, adding connectionId, and ensuring fetchTogglesInterval is sent as an HTTP header, aligning implementation with documentation. Fixed a metric timing bug in yggdrasil by resetting and initializing metric bucket start times, verified through testing. These changes improved data collection, accelerated feedback loops, and strengthened the consistency and reliability of backend systems and instrumentation.