Senior Consultant applicants have rated the interview process at MITRE with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 65.8% positive. This is according to Glassdoor user ratings.
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There were three one on one interviews and a group presentation. This was following an initial HR interview. Process took almost a full day. Everyone was friendly and professional. Although I did not get the position (it was a bit different than I had expected, and required a slightly different knowledge base), they were clear about why.