I was referred to Aetna by a friend. I was initially contacted by one of the executive assistants and scheduled the interview with her. On the first day of interviews I had 2 panel interviews, each one with 2 Underwriting Managers/Unit Leads. They asked a lot of situational questions like "Tell us about a time you made a mistake. What did you do and how did you handle it". They also asked a few math questions consisting of percentage calculations. These shouldn't be very hard if you have an acumen for math. Some of the managers were very easy to converse with while others held their statuesque poker faces but don't let those guys psych you out. About a month or so later I got a call from the same executive assistant to schedule another interview date. It was all the same process but just with different managers.

Two rounds of interviews at their offices and then a phone call one week later. I was interviewed by two employees directly across from me and then one on a conference call.