"I really value Joost's ability to spar on any topic. Whether it is technical or process related, Joost generally seems to have some sort of opinion or can quickly reason about it." - Head of Software
"I don't think Joost will ever let himself get beaten by a challenge." - Software teammate
"Joost's view on how we should treat the product we're making has drastically improved our ways of working, not only as a software organization but also for me personally." - Product owner
"Joost, you have an inspiring personality, you make everything you do almost extra ordinary." - SCRUM master