Agent applicants have rated the interview process at CoStar Group 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 50.8% positive. This is according to Glassdoor user ratings.
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It was very extensive. Took 4 months to get hired with background check and finger printing checks. Overall I feel it was very worth it and they ate a great company to work for.