Worked on the amzn/rdma-core repository, focusing on low-level programming within the pyverbs device module. Addressed a bug affecting the accuracy of API outputs by correcting the width_to_str mapping, ensuring that a width value of 8 is now properly represented as '12X'. This fix resolved a mismatch that previously caused confusion for users interacting with device drivers. The solution involved careful updates to the mapping array and thorough verification to prevent regressions. Utilized Cython and device driver expertise to implement and validate the change, demonstrating attention to detail in maintaining the reliability and clarity of low-level system interfaces.