Summer Intern applicants have rated the interview process at TTX 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 60.4% positive. This is according to Glassdoor user ratings.
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Very straightforward interview. Talked to plant manager on the phone. Pretty casual. I enjoy this type of interview and feel it is better than canned questions. I would not be worried about it if you're good at riffing with people.