Johan Janssen
Software Architect at ASML
Johan Janssen is a Software Architect at ASML, where he focuses on building high-quality software in demanding, fast-paced environments. Over the course of his career, he has helped organizations deliver reliable systems at speed without compromising maintainability.
Johan is a seasoned international speaker, having delivered more than 100 conference sessions across 28 countries at leading events such as JavaOne, GOTO, Devoxx, JavaZone, J-Fall, Jfokus, and YOW!. He is a recognized expert in the Java ecosystem and has been honored with multiple awards, including Java Champion, JavaOne Rock Star, and Oracle ACE Pro.
Talks at YOW! Brisbane 2026
Johan is working as software architect at ASML. He has been working for various demanding companies where rapidly delivering high-quality software was very important. Johan regularly writes articles around Java for InfoQ. He presented 100+ sessions in more than 25 countries at 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.