Applied online and got HR's email back on the second day. Then scheduled a phone interview, including questions about why Epic, my background, and a question about machine learning (using SVM). Then did the online assessment. After that, got the onsite interview.

Onsite interview starts at 8:15 (too early). First is a demo about the software, then talk to one software engineer to get some ideas about the company. The third round is a case study: develop a data structure for an emergency room. The fourth round is an informal presentation about your project. Then go to lunch with one software engineer. After lunch is a campus tour and HR wrap-up.

No difficult questions. They are trying to help you, not embarrass you.