Overall the interview process went well they took a little bit longer than usual to get back to candidates and the final was in the office in Chicago where they provided all travel expenses and hotel.

Math screen with very fast paced questions, then out of the next 5 interviews, only 1.5 were technical and other 3.5 were asking the same questions on repeat. Technical questions were much, much easier than initial math screen. Company said "final round interview" and then followed up with more interviews with no explanation. Seemed like they cared more about how witty you were with responses than capable of doing the job.