During January 2025, Kalle focused on enhancing CI reliability for the schneems/php-src repository by addressing cross-compiler compatibility issues in C code. He resolved a C23 syntax incompatibility that affected Visual Studio 16 environments, specifically by initializing struct members to zero to ensure consistent behavior across different compiler versions. This work, centered on build systems and C programming, did not introduce user-facing features but improved the stability and maintainability of the CI pipeline. By targeting compiler compatibility and reducing flaky builds, Kalle’s efforts contributed to a more robust development workflow, reflecting a depth of understanding in build engineering practices.