Simeon Warren developed cross-platform Bazel 8 compatibility and CPU value detection for the tweag/rules_haskell repository, focusing on improving build reliability across Windows, macOS, and Linux. He updated the build system configuration to align with Bazel 8 standards and implemented functions to accurately detect CPU values on different operating systems. This work required a strong understanding of Bazel, Haskell, and Python, integrating these technologies to ensure consistent build behavior regardless of platform. Although the contribution was limited to a single feature over one month, the solution addressed a nuanced aspect of cross-OS build environments, demonstrating depth in build system configuration.