Worked on advancing Kotlin language design and compiler infrastructure across the Kotlin/KEEP and google/kotlin repositories. Delivered formal design proposals, including a named parameter modifier for function parameters and the revival of explicit backing fields in properties, each accompanied by comprehensive documentation outlining motivation, design, and migration strategies. Improved documentation discoverability and onboarding by updating key project resources. Addressed a critical false-positive in Kotlin FIR analysis on the JVM, ensuring accurate identity-sensitive operation warnings. Collaborated across repositories, applying expertise in Kotlin, Java, and static analysis to enhance language features, compiler correctness, and maintainability through clear technical writing and architectural improvements.