Worked on enhancing the Zig build system within the ziglang/zig repository by implementing support for Autoconf-style @FOO@ variable expansion in configuration header generation. Leveraged Zig programming and build system development skills to introduce dynamic runtime configurability, allowing configuration header values to be added during build.zig execution. This approach improved flexibility and adaptability of build configurations across diverse environments. Developed comprehensive tests to validate Autoconf variable substitution scenarios, ensuring robust automation and cross-environment reliability. Focused on configuration management and testing, the work addressed the need for more dynamic and customizable build processes, deepening the build system’s capabilities for future development.