The process is the same as has been listed here before multiple times: initial application on their website, a 30-minute phone interview, various online-proctored technical assessments (including a programming portion in which pseudocode is acceptable), and finally an on-site interview day which seems to vary slightly from person to person. All responses from HR and all other departments at Epic were delivered to me in a very timely manner, starting from my initial application.

The interview questions were largely behavioral questions, i.e., "five things you are not," etc. Prepare for those as you would for any interview. Arguably just as important is demonstrating active interest in the company, making connections with the people you meet, and trying your best to learn as much as possible during the process. It's better to be over-enthusiastic than to come off as the opposite!