Operations applicants have rated the interview process at Optiver 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 55.3% positive. This is according to Glassdoor user ratings.
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Zoom interview with two interviewers. Friendly people, questions were not that hard. Normal mix of questions from the company and opportunity for me to ask questions. Interview went for about an hour.