I applied online. The process took 1+ week. I interviewed at Optiver in Dec 2021
Interview
Only one tricky math problem without enough time to calculate. The logic is very simple but time isn't enough. The whole interview is pointless. Nothing else is asked so it is pretty unfair.
Ask questions not so hard but unprepared. The interview is not so hard but need to prepare very well for leet code data structure questions. I think the experience is below average compared to other companies.
Hr asking some generally questions about my background, my past experience and my current job and my motivation, taking around 20 minutes, then replying to me after about one week later
OA with quick probability questions requiring estimation and cognitive ability games that test memory and reaction speed. First round was betting game with dice and cards. Be ready to build a confidence interval anytime you answer a question.