Very relaxed, informative and collaborative. Ask questions and expect hard questions. They test how you question a question more valuably than how you answer said questions. Now I don't think.
I applied online. I interviewed at NTT Training (Denver, CO) in May 2017
Interview
An hour long prescreening on the phone with a department manager, then one two hour long interview with the management team. Each came in separately over that amount of time.
I applied through a staffing agency. The process took 2 days. I interviewed at NTT Training (Centennial, CO) in Jun 2014
Interview
My Interview was very straight forward and relaxing. I was asked the basic questions about myself and was told exactly what they where looking for and when I would start.