A few tests; interview was mostly going over company values and then giving a short 10 minute presentation. The tests were difficult, but in a logic way more than hard math.
Long interview process, but it was not harder than the skill assessment. Final interview process takes about 4-5 hours of demonstration, case study, 10 minutes presentation, and recruiter interview. Skills assessment will take about 2 hours of testing your ability in how quick you can adapt to the Epic's system and learning.
Quick 30 minute phone interview, asking mostly about why you want to work for the company, why you are suitable for the role, and other questions related. It was more of a get to know you screening before the actualy, technical interview rounds.