Andrew Novak focused on stabilizing cross-platform builds for the protocolbuffers/protobuf repository by addressing a recurring build failure related to CLOCK_UPTIME_RAW usage. He implemented macro-based conditional compilation in C++ and C#, ensuring that CLOCK_UPTIME_RAW was only included when feature test macros were defined. This approach prevented undefined symbol errors across various build systems, reducing platform-specific CI failures and improving overall build reliability. Andrew’s work demonstrated a strong understanding of build systems, error handling, and cross-platform development. By collaborating with maintainers, he helped align build-system compatibility, resulting in more consistent releases and fewer regressions in the protobuf codebase.