Worked on the JetBrains/intellij-community repository to enhance the stability of Kotlin interop rename flows within the IDE. Focused on refactoring and bug fixing, the developer addressed a regression in the Foreign Usages Rename Processor that previously caused incorrect rename behavior when Kotlin code interacted with foreign languages. By correcting this issue, they improved the reliability of cross-language refactoring, reducing the risk of broken references and minimizing potential user impact. The solution involved expanding regression test coverage to include both Kotlin and foreign language scenarios, leveraging expertise in Kotlin and refactoring to ensure robust multi-language support and maintainable code quality.