They actually contacted my references and did a social media review of my public accounts. They also did a background check - I know one candidate was eliminated when something came up. We did a phone interview with the Deputy Post Auditor and two senior auditors. A week later they brought me in, I spent about 30 minutes doing some exercises in a room, can't recall but I think it was about interpreting data. Then we had an in-person interview with the Chief Post Auditor, the Deputy, HR, and 2 senior auditors. They're really just looking for "smart" people, it doesn't matter what your background is. Can you interpret data, synthesize a lot of information, interpret policies/laws. Came away very impressed with how sharp everyone was, and how well it was run.