Strategy Manager applicants have rated the interview process at Vertex 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 47.3% positive. This is according to Glassdoor user ratings.
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Starts with a recruiter screen, hiring manager, then panel - all of which focus on behavioral. Then there's a case study and final round. I opted out before getting to the later stages so am unsure of what the case would be or what the final round is like.