Developed and delivered the JoinMap::try_join_next feature to the tokio-rs/tokio repository, enabling non-blocking retrieval of completed tasks along with their associated keys. This addition improved concurrent task handling by allowing asynchronous checks for task completion, reducing latency in task orchestration and increasing throughput for parallel workloads. The work involved designing and implementing a new API surface in Rust, with careful attention to asynchronous programming patterns and maintainability. Throughout the process, the developer applied skills in Rust, API design, and task management, contributing to the robustness of Tokio’s non-blocking primitives without introducing any reported bugs during the development period.