I got a recruiter's email and sent in my resume. Their interview process is remarkably close to what they tell you it will be, which was a nice surprise.

IIRC, the first round included both a 30-minute phone interview and an online assessment, taken at two separate times. My phone interview included HR-ish questions, e.g., "Why Epic?", and the interviewer also asked me to describe a project I did. The online skills assessment was on ProctorU. I think the other Glassdoor reviews describe it pretty well, so I won't try to describe it more here. (Everyone I know at Epic hates ProctorU, by the way.)

The second and final round was the onsite interview day. The three interviews themselves were only about 2 hours combined, out of the 6-7 hours I was there. They gave me and other candidates a lot of background about the company and showed us a demo of their software. I got to speak to a handful of developers on various teams, and they all allowed more than enough time for questions about basically anything Epic-related or software-related.

The interviews themselves felt easier than the assessment. First was an interview where I spent 20 minutes talking about a project I did, like the phone call. Then, for the rest of the time (the interview was 45 minutes total), they let me ask questions about anything Epic-related. In the second interview, I think they call this the "design" interview. This was more of a usability interview (no coding!) with several questions asking how to implement specific features in a way that's best for the user experience. The final interview was with my recruiter, and she asked me HR questions (surprise!) for half an hour.

Three days after my onsite, I received an offer over the phone.

Describe a project you did.