quantitative and mathematical; brush up probability questions. interviewers are friendly but the questions are quite difficult if you're not really good at math. They have like 4 or 5 rounds before on-site interview. It was a nice experience on the whole.

The interview process consists of an online assessment, phone screen, phone interview, and final interview. The phone screen was with a recruiter, the phone interview was with a trader, and the final interview was with a trader.