Worked on improving concurrency reliability in the grafana/loki repository by addressing a critical issue related to goroutine leaks in the Loki downstreamer. The solution involved checking for context cancellation before sending errors to a channel, ensuring that resources are properly released during query processing interruptions. This fix was accompanied by a regression test to validate that no leaks occur when cancellations happen under concurrent conditions. The work demonstrated strong backend development skills, particularly in Go, with a focus on concurrent programming and robust testing practices. These changes enhanced system stability, resource efficiency, and overall code quality in the Loki project.