Haechank worked on the p4lang/p4c repository, focusing on improving BMv2 compatibility by addressing a header field size alignment issue in March 2026. Using skills in compiler design and network programming, Haechank fixed the queue_id field in the packet header to ensure it is a multiple of 8 bits, meeting BMv2 target requirements. The work involved updating CMake and P4 code, as well as removing outdated references in tests and configurations to maintain accuracy and compatibility. This targeted bug fix enhanced reliability for BMv2 deployments and reduced downstream debugging, reflecting a thoughtful and detail-oriented engineering approach.