Two one-hour phone screens, then two multi-hour panel interviews with three different groups of people (seven, three, two) over two days.
1) This company has just rolled out a process with pre-determined (mostly behavioral) questions: of which the interviewers just read off the rubric, popcorn-style, and evaluate. It doesn't appear as if the questions change between panels, which means you are answering the same ones repeatedly to different groups. There was one interviewer who deviated slightly and asked questions which built off prior responses, which allowed for more natural and reciprocal dialogue. After multiple rounds of this, it's apparent that this style was chosen (at least in part) to decrease the candidate's ability to assess individual/group-based culture while increasing the company's own ability to do so to the candidate. This is the company's perogative to hold their hand close to their chest while asking differently of a potential team member, of course, but given their alleged emphasis on collegiality it's an unusual move.
2) For the second in-person: while the speed of response was great, requesting less than 24-hour availability the night of the particularly bad snowstorm this year... during the week of Thanksgiving?
3) Sending thank-you notes through Human Resources to be forwarded instead of directly to the interviewers, long after the recruiter had a hand in the process, was something I have never encountered before. Unsure if that's corporate policy.