Worked on performance optimization for the open-telemetry/opentelemetry-java repository, focusing on improving span processing under high concurrency. Addressed bottlenecks caused by direct queue.size() checks by introducing an AtomicInteger-based size counter, enabling constant-time operations and more efficient resource utilization. Updated the drain methods in both JcTools and BatchSpanProcessor to return the number of processed items and decrement the new queueSize counter, ensuring accurate accounting and throughput improvements. Leveraged Java and concurrency techniques to enhance scalability, allowing higher data ingest rates. The work demonstrated a strong understanding of performance optimization and concurrent programming within a complex, production-grade Java codebase.