Kou contributed to aws/s2n-tls by enhancing the build system to support internal libcrypto integration, leveraging CMake’s FetchContent to streamline dependency management and removing unnecessary DEPENDS from add_custom_command for improved build reliability and speed. This work improved cross-platform determinism and maintainability, addressing common pain points in complex build environments. Additionally, Kou improved the clarity of security communications in the ruby/www.ruby-lang.org repository by correcting a grammatical error in a ReDoS vulnerability advisory, ensuring accurate information about affected Ruby versions. Throughout these projects, Kou applied expertise in CMake, build system configuration, library integration, and technical writing to deliver robust solutions.