Jay focused on enhancing USB subsystem reliability and logging robustness across Zephyr4Microchip/zephyr, zephyrproject-rtos/zephyr, and zephyrproject-rtos/mcuboot repositories. He addressed USB CDC-ECM and CDC-NCM interface deadlocks by isolating the TX traffic class, ensuring stable provisioning in embedded systems. Using C programming and deep knowledge of USB protocols, Jay improved build safety by refining preprocessor logic for flash-related code and corrected USB CDC ECM compliance issues. He also strengthened logging reliability by adjusting thread management in MCUboot and ensuring panic log transmission in the SWO backend. His work demonstrated thorough debugging and firmware development expertise.