Karl Krukow is a Principal Engineering Manager at Microsoft, working on Visual Studio App Center, an innovative cloud-based service that simplifies implementing continuous delivery for mobile app delivery. Before joining Microsoft, Karl worked at Xamarin on Xamarin Test Cloud, and co-founded LessPainful, a mobile test automation start-up which created the popular open-source mobile test framework, Calabash. LessPainful was later acquired by Xamarin and became the cornerstone of Xamarin Test Cloud which now lives on in App Center. Karl graduated with a PhD in Computer Science from University of Aarhus in 2006 and worked several years as a senior consultant before co-founding LessPainful. His current professional passions are Xamarin, continuous delivery with focus on mobile, and functional programming (with special love for the Clojure programming language).