Epic was very quick and efficient in scheduling the interview process. They ask for a skills assessment exam (which should take about 2 hours) and a quick profile (which should take about 20 minutes) to be completed within 5 days after they have contacted you. The exam includes logic questions and some basic math questions, with some parts of it timed. The questions varied in difficulty, and some of them were quite hard. It took me longer than 2 hours to complete the exam, and I was unable to finish the timed parts of the exam (which I understand to be pretty common). It was a bit uneasy to take the exam, as it was proctored at home through the computer web-cam (although you also have the option to go to a 'nearby' location to take the exam). There is no real prep work you can do for the exam, but I would suggest taking it in the manner you would a standardized test to make sure you can focus for a long period of time.
The interview itself was about 30 minutes on the phone, and the employee I spoke with was young, very kind, and easy to talk to. It was a very low-pressure interview, mainly going over your resume and discussing why you want to work at Epic. They will likely choose a particularly interesting part on your resume for them, such as a class choice or study abroad, to discuss more fully. As traveling is a big part of the job, it would be good to emphasize your experiences with it. After the interview, they contact you within a week or two with a response to your application. If you make it to the next steps, they inform you as to what those will be. I didn't get to these next steps, so I am not sure what those are or how long the entire process would take. I think the interview went well, but I wish I had taken the exam a bit more seriously at the time I took it, which may have ended up being a determining factor as to why I didn't get an offer.
Overall, I am still very happy with the interview process. Having quick responses from Epic made it very satisfying, and it seems they have a great team. Good luck to those applying!