Andy Hsu worked on the Wiwynn/OpenBIC repository, focusing on embedded firmware calibration to enhance current measurement accuracy. He adjusted the ADM1281 current sensor correction factor from 0.4 to 0.8 in C, directly addressing a request from the electrical engineering team to improve instrumentation reliability. His approach involved sensor calibration and hardware integration, ensuring the updated correction factor aligned with validation team expectations and introduced no regressions in measurement paths. Through code review and version control, Andy collaborated across teams to deliver a targeted feature that improved power management reliability, demonstrating depth in embedded systems and sensor tuning within a production environment.