Post Doc applicants have rated the interview process at NIH 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 79.1% positive. This is according to Glassdoor user ratings.
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I submitted my application and heard back approximately 2 weeks later. I gave presentation of PhD work, met with lab colleagues, and collaborators. Met individually with the PI and afterwards I was given an offer.
Interview questions [1]
Question 1
Name a time you had a challenge with a team-mate and how you solved it