SIOP applicants have rated the interview process at Mattel 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 67.1% positive. This is according to Glassdoor user ratings.
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Super easy. 3 rounds of interviews. HR, manager, senior leadership. Mostly behavioral type questions with a small mini case that was really simple. Nothing to stress about. Overall a really smooth process.