Worked on enhancing Vim key handling and mapleader support within the JetBrains/ideavim repository, focusing on expanding the usability of Vim-style mappings in the editor. Developed support for non-control-character mapleader keys, such as <C-Space>, allowing for more flexible and ergonomic key configurations. Refined the key parsing logic by updating VimStringParserBase#parseVimScriptString to accurately interpret special keys, which improved the reliability of command execution. Emphasized robust unit testing to increase coverage around key parsing and mapleader behavior, aiming to reduce regressions. Utilized Kotlin for backend development and plugin logic, ensuring maintainable and testable code throughout the enhancement process.