Optiver

Really friendly and smart people. The food is fantastic.

Extremely high standards. I understand that trading firms always want to attract extremely smart people. However, the standard settings here are not for hard-working smart people, they are for intelligent smart people (geniuses). In other words, to meet those requirements, long working hours and always pushing oneself every day are inevitable.

Peer review for the bonus. It will be taken as a waste of time if you ask others for help, and colleagues will give help. Since the project assigned to each one is "autonomy," employees here won't be evaluated by how much they help others, but only by the outcome of their own project, which is not helpful to the growth of technical skills in the long term.

Cultural fit. There is hardly anyone asking about your weekend plans, let alone your life plans. People working here only care about working efficiency and how much they can earn every year, etc. What's more, people here are quite ego-driven with their "prestige," which makes me feel uncomfortable sometimes.