Clincial Scientist applicants have rated the interview process at Merck 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 68.3% positive. This is according to Glassdoor user ratings.
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Straight forward, however, I met with ~10 different people that lasted all day. I would have preferred the meetings to be broken up over a day or two. There was a lot of small talk in-between questions.