Dermot Boyle refactored cross-platform OS-specific tests in the JetBrainsRuntime repository to improve reliability and maintainability of the test suite. He used Java and platform-specific development skills to gate the PromiscuousIPv6 test to Linux and macOS using the @requires annotation, preserving intended behavior while reducing test flakiness. For Windows, he extracted the DOS hidden attributes test into a dedicated method, enhancing clarity and simplifying future maintenance. These changes accelerated CI feedback loops, reduced duplication, and made onboarding easier for new contributors. Dermot’s work focused on targeted, maintainable improvements that aligned with the repository’s goals for reliability and development velocity.