Yifan focused on enhancing system stability and reliability across the sonic-mgmt and sonic-buildimage repositories by addressing two critical bugs. He generalized the Nexthop device watchdog configuration regex, improving compatibility with default settings and verifying the changes through automated shell-based tests on x86_64-nexthop devices. In sonic-buildimage, Yifan resolved ASIC initialization issues by switching power-cycle logic from ASIC_PWR_OFF to DP_PWR_ON_DRV and implementing bit-level FPGA writes, which improved kernel panic recovery and platform readiness. His work leveraged embedded systems expertise, firmware development, and shell scripting, demonstrating a methodical approach to risk reduction and robust configuration management in production environments.