Worked on the JetBrainsRuntime repository to address test flakiness in the DefaultCloseOperation test, focusing on improving CI reliability. The approach involved removing calls to PassFailJFrame.addTestWindow() for both testFrame and testDialog, which previously introduced unintended side effects and contributed to unstable test outcomes. This targeted fix aligned the test’s behavior with the JDK-8325851 resolution and was implemented in Java, leveraging strong debugging and test maintenance skills. By enhancing the stability of the test suite, the work enabled faster feedback cycles and more reliable releases, demonstrating a practical application of Java and testing expertise in a collaborative project environment.