Susheel Aroskar developed a client-side code location transmission feature for the apache/spark repository, enabling Spark Connect clients to send function names, file names, and line numbers to the server for enhanced debuggability. Using Python, Susheel implemented this as an opt-in capability controlled by the SPARK_CONNECT_DEBUG_CLIENT_CALL_STACK environment variable, ensuring privacy and configurability. The feature integrates with backend systems by embedding call stack data in user_context.extensions within Spark Connect protobufs, and surfaces this information in OpenTelemetry spans. Susheel validated the implementation with targeted unit testing and provided documentation, demonstrating depth in API development, backend engineering, and debugging practices.