After a few calls with the hiring manager, I eventually had a number of phone interviews with other people in the organization, including other Solutions Architects, VPs of Sales, and executive staff. The interviews ranged from technical to behavioral but were generally informal.

All interviews were scheduled via a scheduling person with whom I did not deal otherwise, but who seemed to be involved in HR paperwork and similar functions.

After the interview process, a wrap-up call with the hiring manager took place, followed by a discussion with HR.

Given a set of components, what would you do with them to build a system?

(The question was purposely vague, so it took a while to eventually narrow down what the interviewer was trying to get.)