Computer Developer applicants have rated the interview process at NanoString 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 50% positive. This is according to Glassdoor user ratings.
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One personality interview, one technical interview. technical interview was easy enough, do practice interviews online and you'll be good. I think it was a code wars question, around difficulty level 2