Pros
Research and technology drives everything here. At times it feels more like a research firm instead of the super successful hedge fund and trading company that they built themselves into. They treat their employees well, and the environment is relaxed. Casual dress, flexible hours, on site gym and showers, tons of snacks, great parties. Probably the best thing is the depth of talent here. They really recruit the best of the best. Technology is solid in the infrastructure, trading, and development groups, and management is committed to investing in tech. They are very conservative when it comes to compliance. They are super focused on not taking risks when it comes to legal responsibilities.
Cons
They are becoming larger and more beaurecratic. They have been around for 16 years and are expanding into new businesses, and with that success they have loss some of the startup vibes they once had. Although they are committed to tech investment, they are now 16 years old and this area of tech is changing rapidly. Constantly upgrading systems brings its own challenges. There is often a blend of old and cutting edge, and sometimes you are on your own if you want to use the cutting edge stuff. They are also heavily regulated, and this weighs alot on how fast they are able to move.