I applied online and was contacted within 48 hours. The first call is made by one of their HR representatives at their office in Plano, TX. It seems fairly straightforward - if they call you, you've essentially been chosen based off of your resume and representative is most likely judging your character. After a brief discussion they'll want to know if you're willing to move forward after you've learned what they tell you about the in-depth details of the position. Afterwards you can expect a few email/document exchanges with a higher manager and information on the training.