Johan is working as an architect at ASML. He has been working for various demanding companies where rapidly delivering high-quality software was very important. Johan regularly writes articles for InfoQ and Java magazines, mainly around Java. He spoke in 20 countries at more than 40 different conferences such as JavaOne, GOTO, Devoxx, JavaZone, J-Fall, J-Spring, Jfokus and JavaLand. Johan received the JavaOne Rock Star and Oracle Code One Star awards.