I initially heard about this company from a friend-of-a-friend who was then in the interview process. More or less on a lark, I applied online with a detailed cover letter for three technical positions and my standard resume.
A week or so later, I received an email from a generic HR address asking me to take an online assessment test. I was expecting a personality test, but there were several logic and math questions. It felt like the old-style SATs. A week after the test, I was asked to set-up a time for the phone interview. The interview was with a Technical Services employee, and the person on the other end seemed a little awkward. Overall, I think the phone interview was used to gauge genuine interest and allow you to ask questions about the company. The process took half-an-hour.
A week later, I was asked to arrange an on-site visit. I'm driving distance away from Madison, so I arranged my own transportation; Epic took care of the rest. The hotel is amazing, downtown Madison is beautiful, and the dinner--covered by Epic--was border-line lavish. Several current employees were there, and they were entirely honest about their experiences with the company. A project manager explained the company's "work hard, play hard" mentality, and shared some criticisms about the company too. I applaud their candidness.
The interview day started with a tour of the campus and an overview of the company. Everyone was pleasant and helpful, and the campus itself is entirely unique. The actual interview was a small, one-on-one with a current TS employee who ran me through several scenarios; he had a serious poker face and I had a difficult time judging how he was receiving my answers. There was also an extensive on-site exam covering mathematics, logic, and programming which took two hours. If you're familiar with computer-based standardized tests like the GRE or CLEP, you'll be fine. Finally, there was a small "exit" interview with HR wrapping up the day and talking about strengths and weaknesses. Frankly, my HR recruter and I hit it off, and that more-or-less sealed the deal for me. (And, I think, for them.)
I received an offer a week later, accepted the week after, and start next month.
The bottom-line: if you've always been giftedly smart, have the desire to learn healthcare/IT, and have a strong, independent work ethic, interview with these guys. It's a young company full of unique, smart people who are willing to train you. Take some MENSA brainteasers to prepare for the test, and give it a shot. The process more "objective" than most interviews--you aren't tap-dancing to charm everyone, just be honest.