It was a one and done interview so treat it as such and not a formality HR gate keeping thing. I spoke with the manager who did not introduce themselves as a manager until after the interview concluded. It was about 2 hours long of various interpersonal questions for handling situations. If you get into an interview, then it was assumed that I already had the technical skillset and they were checking out my personality to see if I could fit in with the manager's team culture. I ended up working for another manager completely, but I still stay in contact with the interviewing manager who keeps tabs on me as well.