I was selected to bypass a phone screening and attend an on-site interview with a large group of other interviewees (though the interviews itself were on an individual basis). The interview day consisted of 4, 45 minute technical interviews each conducted by a different interviewer. Coding on the whiteboard is required (or sometimes on paper), and each of the interviews you are given a complex coding question that you must solve in front of them. These questions may be relatively simple if you remember all of your algorithm knowledge from college very well, otherwise you must go in with a significant knowledge of trees (binary and binary search, etc), data structures in general, searching and sorting algorithms, object oriented programming, just to name a few.