I first had a fairly thorough phone screening with a recruiter, and then was moved to the next round in the process for an in-person interview at the headquarters office. The interview was a standard format, where I had a one-on-one conversation with a representative from the department overseeing the position. The hiring manager was not involved, though it sounds like I would have met with them in the next round of interviews had I been moved through to the next step of the hiring process.