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Anyone know if OCaml was used at FTX, btw? Given that it's big at Jane Street, where SBF worked.

Probably not, given that their public sample code[1] has C++, Go, and Python.

They did not. They were a Python and React shop, with efforts underway to rewrite in Rust.

Python for trading, yikes

Would love to see that codebase

Then again, Stripe has been wildly successful with Ruby

Albeit they’ve had type checking with sorbet for years