Downvoted because I feel this is nitpicking for nitpicking's sake, and it gets more things wrong than right.
> OCaml does type inference
This is an uncharitable interpretation of the author's intent.
> Investors are not market-makers
This is a very uncharitable interpretation of the source:
"In one sense, every investor is a market maker and the only difference is their timeline. Jane Street is far along the continuum towards strict market-making: being willing to buy and sell assets at a price close to, but not exactly at, the market price."
> they actually have a lot of developers working on the compiler and on libraries for OCaml [..] in C or C++
Yes, and? The author still makes the correct point that they gambled hard on OCaml.
> Jane Street is hiring massively and not nearly as exclusive as advertised here
I bet they're hiring very selectively for the high value core jobs discussed, even if they have a large support staff that does things like writing OCaml infrastructure in C/C++ and gets paid much closer to non-hedge-fund rates.
> OCaml does type inference
This is an uncharitable interpretation of the author's intent.
> Investors are not market-makers This is a very uncharitable interpretation of the source:
"In one sense, every investor is a market maker and the only difference is their timeline. Jane Street is far along the continuum towards strict market-making: being willing to buy and sell assets at a price close to, but not exactly at, the market price."
> they actually have a lot of developers working on the compiler and on libraries for OCaml [..] in C or C++
Yes, and? The author still makes the correct point that they gambled hard on OCaml.
> Jane Street is hiring massively and not nearly as exclusive as advertised here
I bet they're hiring very selectively for the high value core jobs discussed, even if they have a large support staff that does things like writing OCaml infrastructure in C/C++ and gets paid much closer to non-hedge-fund rates.