Continuous Improvement Specialist applicants have rated the interview process at Regeneron with 4 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 61.2% positive. This is according to Glassdoor user ratings.
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The interview process was rigorous. I had a phone interview for the first round, then had another set of interviews, which included 3 different sessions with multiple people on the panel. I was given a case study that I had to present to another panel of interviewers.