Worked on the Shopify/grpc repository to improve Bazel build reliability on Windows by addressing a dependency selection issue. Introduced a windows_os config_setting in BUILD files to ensure that Windows-specific dependencies are correctly resolved when the os:windows constraint is set. Updated the default_event_engine_factory to use the appropriate windows_event_engine dependency, aligning build behavior with the target operating system. This fix resolved previous misbundling of OS and CPU constraints in older configurations, leading to more deterministic and reproducible builds. The work focused on Bazel and build systems, enhancing Windows CI stability and supporting faster, more reliable feedback loops for cross-platform development.