Summer Technology Intern applicants have rated the interview process at AT&T 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 65.7% positive. This is according to Glassdoor user ratings.
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First round was a coding test that was straightforward. Next was a small information interview that was very informal. Last two interviews were a code review and a behavioral interview.