Some vocabulary might be helpful here, generally there a few buckets most traders can be put into: 1. Proprietary trading (think hedge funds or the old bank pr

Some vocabulary might be helpful here, generally there a few buckets most traders can be put into: 1. Proprietary trading (think hedge funds or the old bank prop desks, ranges from the bass brothers to renaissance tech in terms of style) 2. Execution or sales traders (often work for or are the counterparts to #1, their goal is get the best price for their clients in the quantities and time frames desired) 3. Market making (essentially providing liquidity to both buyers and sellers) 4. Sales - essentially layered on top of 2 & 3 to interact with 1 With that said, #3 has pretty much been automated in some markets and is the easiest to automate, #2 has had a lot of automation for vanilla stuff, but people are still involved in big, complicated things. #1 may be automated but is largely strategy dependent, #4 is pretty hard to automate...