Abdulo worked on simplifying the build system for the Kotlin/kotlinx.coroutines repository, focusing on reducing configuration complexity and preparing for future API changes. He removed the split JVM source sets, specifically jvmCoreMain and jdk8Main, along with their related compilations, which streamlined the core build process and shortened continuous integration cycles. Using Gradle and Kotlin, Abdulo aligned the project with the upcoming deprecation of the KotlinCompilation.source API, laying the groundwork for a smooth migration. His work improved maintainability and reliability of the build configuration, demonstrating a solid understanding of build system configuration and modern Kotlin development practices within a large codebase.