We designed core interactions for Android XR and developed a custom prototyping platform, that enabled us and the wider organization to quickly build and test different input designs and technical approaches. This lead to multiple new interactions and dynamic UIs, evolving Googles Material design system based on differential eye tracking saccade classifications and hand-tracking, currently being patented. Beyond the core interaction framework and Material design evolution I focused on the privacy aspect of eye tracking, designing visual and technical solutions that are now deeply embedded in Android XR.