Designer applicants have rated the interview process at SiriusXM 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 52.5% positive. This is according to Glassdoor user ratings.
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There are two rounds of interview, first one is HR interview, second one is portfolio interview (overall it was 45 minutes and I walked through two of my case studies) and talking to the design manager.