Aaron Williams optimized the bulk file deletion workflow in the catalyst/moodle-tool_objectfs repository, focusing on performance improvements for Moodle’s back end. He engineered a solution in PHP that reduces latency by bypassing unnecessary remote server checks during bulk deletions, specifically when immediate external deletion is not configured. This approach minimized redundant HTTP requests, improving throughput for operations such as course resets while maintaining correctness for orphaned file cleanup. Aaron’s work demonstrated a clear understanding of scalable back end development, as he validated and documented the changes for traceability. The project showcased his expertise in PHP and performance-oriented engineering practices.