Worked on stabilizing long-running pipelines in the streamingfast/substreams repository by addressing a goroutine leak in the Stats.Close() method. Focused on backend development using Go, the work involved ensuring that the progressBlockRate janitor was properly stopped during repeated Sinker lifecycle events, which prevented resource leaks and uncontrolled goroutine growth in continuous-mode deployments. Introduced a regression test to verify that no goroutine drift occurred across multiple Sinker cycles, thereby improving runtime stability and reducing memory footprint. Demonstrated skills in Go, goroutine lifecycle management, and regression testing, with an emphasis on code quality and robust resource cleanup in backend systems.