Store Employee applicants have rated the interview process at T-Mobile 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 71.4% positive. This is according to Glassdoor user ratings.
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The interview was very casual. A quick talk with the manager in the back, talking about my resume. It seems that the process may be different between stores because they are owned by different people.