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Not niche, Jane Street uses OCaml (and they contribute a lot to the compiler, too), it is "a research-driven trading firm where curious people work together on deep problems".

More about it here: https://www.janestreet.com/what-we-do/overview/



> where curious people work together on deep problems

'curious people': people who got jaded by academia and were attracted by the six- to seven-figure salaries at Jane Street.

'deep problems': Buy X units of Y instrument at A exchange, and sell Z units of said instrument at B exchange, and do this often enough that said company makes a pile of money for itself and its employees (mostly itself, given it can afford to pay its employees six to seven figures).


Jane Street is just one example, OCaml is widely used elsewhere, too. For example, the first compiler for Rust was written in OCaml, too.

I mentioned Jane Street because it uses OCaml for high-frequency trading, and because they are huge contributors to OCaml.




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