Why would they? Hard questions are useful. The purpose of an interview is to determine whether you would want to have the candidate as a co-worker. For a techni

Why would they? Hard questions are useful. The purpose of an interview is to determine whether you would want to have the candidate as a co-worker. For a technical interview, that means you want to understand how they approach problems and communicate about their thinking and solutions. In order to watch someone at work, you need to give them some actual work to do, which means that the problem you set must be hard enough to require genuine effort. Easy questions would be a waste of everyone's time.