During November 2024, this developer expanded test coverage for the JetBrains/kotlin-compiler-server repository by designing and implementing new test samples and updating existing tests. Their work focused on enhancing regression detection and increasing confidence in compiler-server releases by broadening the range of tested Kotlin language features and scenarios. Using Kotlin and unit testing frameworks, they improved the quality and maintainability of test data, which supports faster validation cycles and reduces the risk of post-release bugs. The developer demonstrated strong skills in test automation, code review, and repository maintenance, laying a solid foundation for more efficient future development iterations.