IT applicants have rated the interview process at KnowBe4 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 81.2% positive. This is according to Glassdoor user ratings.
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Simple interview questions. They do ask questions about email security which I wasn't able to answer. If you're doing internship, I suggest researching it for a bit since it seemed like they expect interviewees to know a little about it.