Worked on cross-platform build stability for the AvaloniaUI/angle and google/dawn repositories, focusing on resolving compilation issues related to IOKit-dependent code for macOS and tvOS targets. Addressed platform-specific build failures by implementing conditional inclusion of the IOKit.framework, ensuring that SystemInfo_macos.mm and related components compile successfully across both operating systems. Utilized C++, CMake, and GN to update build system configurations, which improved CI reliability and reduced delays in feature delivery. The work demonstrated a strong understanding of cross-platform development and build systems, with careful attention to compatibility requirements and the nuances of macOS and tvOS development environments.