TSE I applicants have rated the interview process at ADTRAN 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 78.2% positive. This is according to Glassdoor user ratings.
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The second interview process was fun, but long. The HR department was pretty prompt in response time throughout the process, Overall, it was close to four hours consisting of four different interviews.