Kirill contributed to the dotnet/vscode-csharp repository by upgrading XamlTools to version 18.6.11622.36, focusing on enhancing MAUI support and improving the stability of XAML tooling. Working primarily with C# and XAML, Kirill addressed issues related to null reference exceptions, which previously caused design-time crashes, and refined the XAML Hot Reload feature to provide more reliable live UI updates. This work reduced iteration time and runtime errors for developers working on MAUI projects. The changes were delivered as a single feature within the month, demonstrating targeted improvements in front end development and tooling reliability without addressing existing bugs.