Yum Wang focused on reliability and maintainability in core data infrastructure projects, contributing targeted bug fixes to the apache/incubator-gluten and apache/avro repositories. In apache/incubator-gluten, Yum addressed a shuffle file permission issue by explicitly setting permissions to 0644 in the ColumnarShuffleManager, aligning with Spark’s default behavior and preventing distributed access errors. For apache/avro, Yum improved error handling in Java by clarifying DataFileStream sync marker messages, making data corruption or truncation easier to diagnose and test. Across both projects, Yum applied skills in system programming, file processing, and testing, delivering well-scoped, reviewable changes that enhanced runtime stability and developer experience.