I initially stumbled upon Epic booth at my university's career fair on my sophomore year's spring semester. By the way, Epic strongly believes in standardized tests, like SAT, and will definitely ask about the tests you took.I gave them my resume, completed their online application form, then got an email next day inviting for the on-site skills test. The test lasted for about 3 hours and had 3-4 programming problems where you can use any major programming language (you don't have to solve then if you are not applying for a technical problem), questions about a made-up programming language (aims to test your ability to learn new stuff and apply your knowledge), math questions, logic questions and a 1-minute math questions section. I might get some details wrong as it was a while ago, but there is enough information about Epic's skills test anyways. Then, I was told that there are no positions available at the moment and should apply during the Fall semester as they hire most interns then. During Fall semester Epic came to my university's career fair again and they actually contacted me through LInkedIn a couple of days before the fair. I applied through their website again and took the on-site skills test again. The test had the same structure but different questions. Then, a week later I got an email saying that the next step would be a phone interview with a software developer. The phone interview, however, did not contain any technical question, we talked more about my past projects and interests and I had a chance to ask questions about Epic. I asked about their immersion program (it is when Epic's software developers travel to hospitals to see how things really work there in general so that they can write a better soft) to kind of show that I am so interested in Epic that I did some research. I think she liked that. Another week later, I got an email inviting me to their headquarters in Madison, WI. I was also informed that one of two interviews would be with a software developer and I would briefly present a project I am most proud of or find most challenging. They also told that I must be ready to answer some questions about the project and that the whole interview would take about 30-45 minutes.Epic also asks you to bring your university transcripts and a list of three references to the interviews. In addition, I completed personality test online before coming to Madison.
They payed for the flight, hotel and my experience in general was great as I was treated really well and the interviews were not stressful at all, I got a lot of information about what software developers do at Epic and had many chances to ask the developers anything I wanted during two group sessions with the actual developers, both completely informal and you are not evaluated or something. I had only two interviews and the first one was with a developer where I presented a project I worked in the past. You should really prepare for that as a developer would be asking all sorts of possible questions. My second interview was with HR. We started with questions about reference list I brought with me. She asked who of those three people knows me the best and why, what positive things he or she might say about you and what could be some negative things mentioned. Then there were a lot questions like why Epic, what do you like about our internship, what you don't like, what are your other options and how would you choose which offer to accept if you had several (like what factors are important to you). Then, a week later I had a phone call and was told that "they decided to move forward with another candidates".