Incredibly smooth process. Application to interview request took one week, and I was accelerated to the final round of interviews and had an onsite a week later. Day of the interview was great. Went to lunch for an hour with current TDP employees, then we were set up in our own rooms for the case, behavioral, and technical interviews. Each interview lasted 45 minutes, with a 15 minute break. The interviewers were all very helpful and friendly. The purpose of the case is to see how your thought-process works, so make sure to say everything that you're thinking. The behavioral interview was very standard. They're looking for STAR method answers, so brush up on that. Technical interview consisted of 3 problems, so you're restricted to about 15 minutes a piece if you want to do them. Problem difficulty seems to vary (maybe depending on interview location). I received LC easy/mediums with fairly low submission acceptance, whereas someone I know who did an on-campus interview only received 2 LC easy problems. I received an offer two days after my interview.