Data Scientist applicants have rated the interview process at CIA with 2 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 49.3% positive. This is according to Glassdoor user ratings.
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Talked to the interviewer for around an hour, taking about my previous research experiences as well as what I could bring to the company. The interviewers were from the group that I was trying to apply, and seemed enthusiastic.