Antonin Decimo developed cross-platform Windows build support for the tree-sitter/tree-sitter repository, focusing on expanding platform compatibility and improving build reliability. He implemented Windows MinGW-w64 build integration, updating Makefiles and Windows-specific build scripts to enable both DLL and static library outputs compatible with MSVC and clang-cl toolchains. By incorporating a dedicated Windows build step into the CI pipeline, Antonin ensured that Windows artifacts are validated with every change. His work leveraged skills in build systems, CI/CD, and Windows development, utilizing Makefile and YAML to streamline the build process and address the need for broader platform coverage in the project.