Manufacturing Intern applicants have rated the interview process at Rivian 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 45.3% positive. This is according to Glassdoor user ratings.
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Smooth and easy.
Just be true and excited about the company and position you apply for and everything falls into place. The interview is not entirely about how much have but how much you are willing to learn. The interviewer is generally very friendly and welcoming but also extremely smart so don't claim things that you aren't entirely confident about.