IPM applicants have rated the interview process at Amplify 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 54.1% positive. This is according to Glassdoor user ratings.
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Good process, maybe too many interviews but they do a thorough job of making sure they are adding the correct people to their teams. I would recommend checking out their job postings.