Worked on the grafana/opentelemetry-rust repository to address a concurrency regression in the trace export pipeline, focusing on reliability and performance. The main contribution involved fixing the BatchSpanProcessor so that concurrent exports would run in parallel rather than serializing, restoring intended throughput under high-load conditions. This was achieved by spawning export futures on the runtime and respecting the OTEL_BSP_MAX_CONCURRENT_EXPORTS setting, ensuring proper concurrency controls. The work included adding validation and lightweight tests to guarantee non-blocking exports and correct concurrency limit handling. The solution leveraged Rust, asynchronous programming, and distributed tracing concepts to improve pipeline robustness and prevent future regressions.