>I'm sure all their competitors do the same for the same reasons. Trading firms tend to build a lot of their own tech, but Jane Street is special in that they

>I'm sure all their competitors do the same for the same reasons. Trading firms tend to build a lot of their own tech, but Jane Street is special in that they build almost everything in house. Ocaml is practically their own language. No other competitor comes close to this level of owning the entire ecosystem, including programming tools.