Worked on the analogdevicesinc/linux repository to enhance network driver stability, focusing on the MACB driver’s PCS selection logic for Ethernet interfaces. Addressed a critical bug by refining the interface check to ensure the correct PCS is selected for both 10GBaseR and 1000BaseX, which resolved RGMII test failures and improved cross-speed interoperability. This fix increased production stability and reduced test regressions in NIC PHY negotiation. Leveraged expertise in device drivers, embedded systems, and network interface drivers, primarily using C, to improve test coverage and reliability for MACB PCS negotiation across various Ethernet speeds in both testing and production environments.