For Windows Search, Edge & Bing, I studied usage patterns, analyzed market landscape, translated insights back into product design, wrote technical specifications and ran online experiments.
A refresh of the Start menu brought an assistant, local and web search to the same entry point. My study of usage patterns (search terms, typing speeds) defined the interaction model. My studies were one of the first instances of online experimentation on Microsoft's desktop software. Worked on improving relevance and ranking of search results, and brought together many disparate web search interfaces to one holistic design.
Laid the foundations of how search results adapt to screen size: selecting, repositioning and reformatting content. Ran dozens of online experiments on every element of our visual system, and coordinated the release of a major refresh.
I directed initial user testing of ideas on how Cortana can provide insight specific to a particular app. The results of these tests and our design iterations became Cortana Insights in the Edge browser. Today, this same paradigm is used for Bing's AI Chat interface in Edge.