During February 2026, David Sanders developed a build recipe for the core-math library in the JuliaPackaging/Yggdrasil repository, focusing on delivering correctly-rounded IEEE 754 math functions as a shared library for both binary64 and binary32 formats. He integrated C and C++ components with Julia, ensuring the build system met strict platform constraints such as GCC 10+ and SSE4.1 support on 64-bit x86_64 targets. By pinning to a specific core-math commit, David enabled reproducible builds and improved numerical consistency for downstream projects, reducing rework and enhancing portability. His work demonstrated depth in build systems and library development.