Worked on enhancing performance and reliability in Go-based backend systems, focusing on concurrency and correctness across the prometheus/client_golang and temporalio/sdk-go repositories. Addressed concurrency robustness by introducing a regression test for promhttp, which exercises InstrumentHandlerCounter and InstrumentHandlerDuration under high load with multiple goroutines to catch data races and ensure stability. Improved the ScheduleWorkflowAction in temporalio/sdk-go by fixing a bug that previously left the Priority field unset, ensuring accurate priority handling for scheduled workflows. Demonstrated strong skills in Go, concurrent programming, and testing, with a focus on cross-repository collaboration and maintaining high standards for code reliability and correctness.