I got contacted by a head hunter. The first step is to get the green light from the CEO. After that you need to pass C and C++ online test (1h each). You will get no feedback. Only if you pass the tests you will have another WorldQuant interview exam (2h) on critical thinking, probability, basic programming and logic questions. These questions are typical of what you find on book about Quant interview. No feedback from WorldQuant. I only learn by the headhunter that they are passing !