I applied online. I interviewed at BlockTech (New York, NY)
Interview
1 HR round, 1 OA, 1 brainteaser round, 1 market making round. The interviewers were very nice and friendly, HR also replies message very quickly. Overall positive experience. There was also a short feedback session on why they accepted/rejected you.
Interview questions [1]
Question 1
For brainteaser round it was some probability question, similar to what you see on the green book. In general mental math ability is quite important.
