Michel Weststrate (Msc) is tech lead and open source evangelist at Mendix. He has been active as both a frontend and backend developer in different stacks. An occasional speaker at software conferences, he has authored video courses on egghead. Intrigued by several (transparent) reactive programming libraries, he researched and worked on making the ReactJS framework more reactive while addressing predictability and maintainability constraints in other solutions. This led to mobservable (nowadays MobX), which was quickly adopted at Mendix. He's very active in the open source software community, and he authored MobX, Immer, and several small libraries, and coauthored MobX-state-tree.