Leonid focused on improving codebase cleanliness and maintainability across the JetBrains/resharper-unity and JetBrains/resharper-fsharp repositories during February 2025. He targeted unused import statements in Kotlin source files, applying code cleanup and refactoring skills to streamline the code without introducing functional changes. In resharper-unity, Leonid removed redundant imports, including a specific cleanup in ProfilerActionState.kt, while in resharper-fsharp, he addressed similar issues in the FSharp plugin. These efforts enhanced code readability and reduced potential maintenance issues. The work demonstrated a methodical approach to cross-repository hygiene, leveraging Kotlin expertise to ensure consistent, maintainable code across major JetBrains plugins.