Undergraduate Research Assistant applicants have rated the interview process at Princeton University with 2 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 70% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
They asked for a detailed project proposal and approval from a faculty advisor who would supervise your work. I formatted my research proposal in latex and contacted relevant faculty. Interested faculty asked me about past research experience and more details about my proposal.
Interview questions [1]
Question 1
Asked about technical background needed to complete proposal