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Presumably Jane Street didn’t choose C++ because they wanted to reduce bugs introduced by the preservation of state; the killer of prop shops. F# was developed six years after their founding, hence too young, and more importantly, a Microsoft-owned clone of OCaml. I don’t think it even ran on Linux before 2015. Today, F# might just suit the job, assuming you are open to being locked into the .NET family. An interesting idea to say the least.

Why C++ now? Still the fastest and tons of quants and highly skilled programmers know it. When you consider the correlation between C++ developers’ technical acumen and quantitative skills, coupled with the maturity and increasing convenience of the ecosystem, it makes sense.

> assuming you are open to being locked into the .NET family

Which is not different than being locked into e.g. JVM family, or even being locked into OCaml itself.

.NET (redone as Core) was a much worse choice 20 years ago than it is now of course. If they would fully open up the debugger, I would prefer it over the JVM. OCaml is more open (for .NET Core, there is still no good open debugger and the JVM suffers from Oracle keeping closed performance enhancements which, in my experience, do make big difference) than either of them, but not many people like programming it so it is hard to find people.

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