Shiv Shah enhanced the JetBrainsRuntime repository by overhauling its JVM TI testing framework to improve reliability and coverage. He replaced the legacy othervm test execution flow with a driver-based approach, enabling more consistent and robust test runs. By clarifying VM compilation mode requirements within test descriptions, Shiv reduced misconfigurations and minimized flaky results. He also addressed critical JVM TI test failures, such as out-of-memory errors in the CodeCache and issues with -Xcheck:jni, ensuring proper exception handling and class reference management. His work, using C++, Java, and JNI, resulted in more stable runtime releases and faster, more actionable CI feedback.