The interview process was very chill. I interviewed with 3 different groups. Most of the questions were behavioral and just talking about my previous projects. A few technical questions that were pretty straightforward. Most of the time, the interviewers talking about their specific group what what they did at APL. Each interview with each group was about 2 hours and you meet with about 4-5 different sets of people for each group. They provided lunch, which was also part of the interview process.