Worked on build configuration improvements for the wallet-core repository, focusing on enhancing Kotlin multiplatform support. Addressed persistent expect/actual warnings in Kotlin modules by introducing the -Xexpect-actual-classes compiler argument within the Gradle build process. This adjustment reduced warning noise during compilation, leading to smoother builds and more reliable continuous integration outcomes. By proactively resolving these warnings, the work decreased the maintenance burden and helped align the codebase with upcoming multiplatform development needs. Utilized skills in Gradle and Kotlin to implement targeted changes that improved build stability, ensuring that future development on wallet-core proceeds with fewer build-related interruptions.