The interview is intense, but not overly stressful. Upon passing the initial interview, the interviewer extends an invitation to participate in structured training/certification process. The hiring process as a whole requires prospects to put in a considerable amount of time and effort (classroom training, observation, hands on training, and certification exam) upfront before the position is officially offered. However, it is a necessary for the company in order to find really committed individuals, and employees are compensated when hired.