I received a call from a recruiter about a week after I submitted my resume for the position. She scheduled a phone interview with the hiring manager to occur a few days later. The hiring manager called and asked me a few technical security questions, along with general questions about my experience and intentions for looking around. The next day the recruiter called me in for a face-to-face interview. A few days later met with the hiring manager and another Lead Security Engineer at their SSC location in NW Atlanta. Great complex, complete with food court, gym, bank, the works. I was called back for a second interview with the hiring manager and the CISO a few days later. Asked some good questions by the CISO. Offer presented within two days after that.
Overall not a difficult interviewing process. They appear to have some very sharp people over there; if you know your stuff you should be fine.