First,Oates Associates allows you to submit a resume anytime, even when they aren't hiring. When you get a call for the interview, they are very willing to work around your current schedule ranging any time between 6 am and 7 pm. The callback is likely part of the interview to determine if you're really interested in the position. After being offered a position and accepting, they offered an informational interview for you to learn more about the company and make sure it is a good fit for you.