Andrey Silichenko enhanced the JetBrainsRuntime repository by improving the reliability and portability of Java test harnesses and process management tests. He enabled native execution for processor information tests, streamlining test commands and reducing cross-platform flakiness. In addition, Andrey increased native test timeouts and refined Windows environment-variable handling for the Java ProcessBuilder test suite, addressing compatibility issues and ensuring more dependable CI feedback. His work, primarily in Java and focused on runtime and testing, targeted the reduction of CI noise and debugging time. These targeted improvements demonstrated a thoughtful approach to cross-environment reliability and maintainability within the codebase.