Oleg Butakov focused on stabilizing cross-platform builds for C++ projects, addressing macOS GCC compatibility issues in both the microsoft/vcpkg and uxlfoundation/oneTBB repositories. He refined build system logic using CMake and compiler toolchain expertise, implementing targeted fixes that improved assembler version detection and adjusted diagnostic pragmas. These changes resolved build failures and reduced CI noise, ensuring TBB functionality was reliably available on macOS with GCC. By contributing precise, low-risk patches, Oleg enhanced build reliability and maintainability for downstream users, demonstrating depth in compiler configuration and cross-platform development while maintaining clear traceability through well-documented, auditable commits.