Worked on enhancing the tweag/rules_haskell repository by delivering cross-platform compatibility for Bazel 8 and implementing robust CPU value detection across Windows, macOS, and Linux. The approach involved updating build system configurations to align with Bazel 8 standards and introducing functions that reliably detect CPU values on different operating systems, thereby improving build reliability and developer experience. Leveraged expertise in Bazel, Haskell, and build system configuration, with supporting use of Python for scripting and automation tasks. The work focused on ensuring consistent build behavior across environments, addressing a key challenge in multi-platform development and contributing to smoother project maintenance.