During May 2025, Daniel Schaefer enhanced Windows build reliability and cross-platform ASN.1 support for SourceKit-LSP by integrating SwiftASN1 into the build process. Working across the swiftlang/sourcekit-lsp and mrousavy/swift repositories, he resolved build failures by updating CMakeLists and extending BuildSystemIntegration, ensuring cryptographic signing workflows functioned correctly. Daniel used C++, CMake, and Swift to address dependency management and build automation challenges, enabling successful builds and test runs on Windows. His work demonstrated a strong understanding of build system configuration, as he delivered targeted fixes and feature updates that improved both the robustness and portability of the development workflow.