Phone interview with HR person. She was pleasant and professional. Asked a series of test like questions. Somewhat unusual. Second round was with the manger. Don't recall his exact title. But pretty much as expected. Third/Fourth round was with a couple of technical guys. A couple of "stump the chump" style questions but not as bas as some. Inexperience of the interviewers showed. Next I was invited to meet with them in Chicago. I initially agreed to "pencil it in" and would confirm later. Then when I had a conflict the got angry and it turned very unprofessional. They would no longer reply to emails or texts. I was shock at the level of unprofessionalism they were displaying. If it's any indication if how they behave a company I am very glad it turned out the way it did. I would not want to work for anyone who behaves like that.