Summer Intern applicants have rated the interview process at Group One Trading 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 61.8% positive. This is according to Glassdoor user ratings.
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The interview rans ~4 rounds if I remembered correctly. First ones were mostly behavioral and running through resume. The last one was a few intern candidates (~5) doing round-table, with technical questions, statistical/probability-related