Operations Analyst Intern applicants have rated the interview process at BlackRock 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 60.4% positive. This is according to Glassdoor user ratings.
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Started with a recruiter/HR interview, which was standard behavioral questions and was easy, they were really nice. Then the specific group will interview you during a separate time which is more of a "superday" since you will have multiple rounds with different groups back to back.