Epic Software Developer interview questions

I received a request for a phone interview the day after I applied for the position. Before the phone interview, I took a online personality exam (Rembrandt Portrait). Not difficult and can be somewhat easy to manipulate. About two days afterwards, I was called by a very monotone and uninterested person, apparently a software developer, and asked a series of questions I already answered on my application. A few days later I began email correspondence with the HR devision about booking my flight, hotel accommodations, if I would like a guided tour and paid dinner with an employee. I will be leaving in a couple days for an onsite interview. My research as held me to believe Epic is a casual company that caters to newly graduated college student (Me). So I am looking forward to the interview. Relocation will be required.