Hwei En worked on the UWOrbital/OBC-firmware repository, focusing on enhancing data integrity and reliability in the firmware’s command handling. They addressed a bug in the MainCommand component by implementing robust data validation logic to ensure command parameters consistently matched expected formats, reducing the risk of malformed commands reaching hardware. Using Python, SQLAlchemy, and SQLModel, Hwei En developed comprehensive unit tests that covered scenarios with missing or mismatched parameters, thereby improving test coverage and maintainability. The work demonstrated a methodical approach to backend development, emphasizing correctness and long-term reliability through targeted validation and thorough automated testing.