Worked on the hafs-community/HAFS repository to address compatibility issues following the bufr 12.0 upgrade, focusing on maintaining reliable end-to-end data assimilation. The primary contribution involved fixing integer data type handling in the ufbqcd subroutine to ensure correct GSI data format processing. Additionally, reverted the use of isnan checks in vtcd, as these were no longer valid for integer types, thereby preventing invalid operations. Managed submodule references using Git to align with the latest development phase, supporting consistent system behavior with updated data formats. Demonstrated skills in bug fixing and submodule management, emphasizing careful attention to evolving data standards.