It‘s a very hard interview，asking for different question like algo ，puzzle，math. From the beginning it's a lttle bit hard，you need to finish 3 algo problem on time. I think if you do not prepare，you definitely will fail.
Received an online assessment test, 4 coding questions to be finished in two hours, leetcode medium to hard questions, passed all the available tests but might have failed the hidden ones. Rejected after finishing the test
Interview questions [1]
Question 1
leetcode medium questions, mostly around data structure and algo
I applied online. I interviewed at Hudson River Trading (New York, NY) in Oct 2020
Interview
I pass the first round of interview and the interviewer is so nice. They spend 10 minutes on your resume and then move to some coding and statistical questions. From my point of view and from the experience of my friends. We have to answer at least 3 questions to 4 questions in order to get to the second round. The first two questions are basic maths and statistics, but the third and fourth questions need more effort and need to explain the intuition of your answers.
After the technical part, we spend around 15 minutes chatting about the team and the company. The message that the interviewer shared with me is that " you have to know how to work with really smart people here, and try to find smart people to work with."
Interview questions [1]
Question 1
Q1: Brain teaser, very simple, about conditional probability
Q2: statistical estimation, we need to know how to use CLT and the confidence interval, simple and easy
Q3: Hard question, need some knowledge in Markov chain and conditional probability. The hardest part is that I was asked to answer the following question" explain your result intuitively， what is the reason for that expectation be that value?"
Q4: Dice game question with infinite many rolls, it is a hard one and the result is really counter intuitive.
