Sales 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 52.3% positive. This is according to Glassdoor user ratings.
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It was a one way interview at the website they provided, took me around 20 minutes to finish. It is all behavioral questions, but some were out of expectations. I'd say its a average difficulty level.