The Human Element Is Incredibly Important to Jane Street Trading

Trading is way more manual than I think people often think of it, especially people who know about Jane Street by paying attention to the technical side of their work. The human element and the judgment that comes in there is actually incredibly important to how we operate. You still have lots of people making trades over the phone, especially for big trades. And you have people making manual trades and making tiny manual adjustments to trading systems throughout the day.