Worked on the 0xPlaygrounds/rig repository to address a critical issue in asynchronous streaming by fixing span context leakage. The solution involved replacing the use of span.enter() with the .instrument() method from tracing_futures, ensuring that span contexts were properly isolated and propagated across concurrent tasks. This change improved the reliability of tracing and observability, particularly under high-concurrency workloads where cross-task contamination could occur. Comprehensive tests were added to validate span context isolation, reinforcing correctness and developer confidence. The work demonstrated strong proficiency in Rust, asynchronous programming, and test-driven development, focusing on robust, maintainable solutions for complex concurrency challenges.