There is a CodeSignal that they send out that you have 2 weeks to complete. Still waiting on hearing back results of that but the hiring manager contacts you personally.
Got an Online Assessment from them which was in code signal 2 weeks after I applied. 4 questions in 100 minutes where the questions varied from easy to hard in that order.
J'ai postulé en ligne. J'ai passé un entretien chez Hudson River Trading
Entretien
Got to coding interview process and was able to answer 2/4 of the questions. I don't remember most of the questions though. Interviewer that sent out the email seemed nice.