Pros
Two Sigma honestly cares about their employees and they do a great job of showing it by empowering people to make decisions. Also: -There is almost no bureaucracy and people don't push their own agendas -Highly collaborative, very few pointless meetings -Tons of learning and development opportunities (Tech Talks, Town Halls, Hackerlabs, etc) -You get lots of autonomy -"Get things done" attitude, not a "let's talk about getting things done" attitude -Strong compensation and benefits package -Only hire smart and nice people
Cons
Since there are not a lot of formal processes, you sometimes have to take a lot of initiative and ownership to get things done. This can also lead to things taking longer than they need to. A pretty steep learning curve if you like structured on-boarding.