Originally, the field of usability and interaction design was slow, cumbersome and costly. These were some of the reasons that it was not adopted very fast among practitioners. However, recent years a lot of the methods and techniques have been adapted to better fit the fast moving development processes that are predominant in software companies today. But what do you do when you can’t include users because of NDAs? How do you handle the fierce security demands, that are part of your project? Does your customer really know their users, or do they only think they do? And when you have a deadline, how do you avoid UI slowing your progress? This talk is a case story of how UX was included in the agile development process that resulted in the first Danish mobile bank app: Danske Banks mobile banking app.