Worked on enhancing cross-platform test reliability for the Shopify/ruby and ruby/ruby repositories, focusing on the exec command test suite and Windows CI stability. Addressed platform-specific issues by replacing shell-dependent test logic with cross-platform Ruby scripts and removing unnecessary permission changes, which streamlined test setup and reduced maintenance. Improved environment correctness by validating RUBYOPT and RUBYLIB handling during bundle exec. In ruby/ruby, resolved Windows test fragility by conditionally skipping unsupported process title retrieval, using Ruby’s Gem.win_platform? check. Leveraged Ruby, Bundler, and shell scripting to deliver more robust, maintainable, and faster continuous integration across diverse development environments.