I applied to T-Mobile last year in October for a summer internship and heard back in March. I got invited to the Magenta Match at their Bellevue HQ, which is basically like a career fair but for we're talking to managers of different teams within T-Mobile. There are about 6 rounds that are 10-20 minutes long where you choose different managers to talk to and give your resume to. In the beginning, all the teams explain what they do and what they're looking for. Ended up not hearing back from the first Magenta Match and I got invited to another magenta match in April (Pretty sure it was for the TechX) .
Interview questions [1]
Question 1
It was mostly me talking to the manager of the team and asking questions.
I applied online. The process took 1 day. I interviewed at T-Mobile (Seattle, WA) in Mar 2018
Interview
1 phone interview with members of the team, consisted of brain teasers and network questions; osi model etc. Discussed experience with technologies and went over resume to explain projects and work experience. Heard back a week later with offer.
I applied through other source. The process took 2 weeks. I interviewed at T-Mobile (Bellevue, WA) in Apr 2017
Interview
Phone interview with the hiring manager on why that specific position. There were three rounds within the same department to understand the fit which eventually led to an offer. All the interviews were conducted via phone call.