Worked on the JetBrainsRuntime repository to enhance the reliability and portability of Java test suites, focusing on both the test harness and ProcessBuilder components. Addressed cross-platform test flakiness by enabling native execution for processor information tests and streamlining path resolution, which improved the accuracy of processor data and reduced CI noise. Further strengthened test robustness by increasing native test timeouts and refining Windows compatibility, ensuring more dependable validation of Java process behavior across environments. Utilized Java and runtime testing skills to deliver targeted improvements that accelerated CI feedback and reduced debugging time, contributing to more stable and maintainable test infrastructure.