Andrew Sumsion developed Vulkan feature gating for the AvaloniaUI/angle repository, focusing on enabling promoted extensions and Vulkan 1.1-based features within the renderer. He implemented centralized logic in C++ to check for either the presence of specific extensions or core Vulkan version support, ensuring that advanced graphics features are only activated when supported by the device. This approach improved cross-environment compatibility and streamlined future maintenance by consolidating gating checks. Andrew validated the gating logic with targeted tests, emphasizing stable operation across diverse Vulkan-capable hardware. His work demonstrated depth in graphics programming and careful attention to robust, maintainable Vulkan integration.