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Jane Street builds its trading systems in OCaml, relying on the type system to catch errors at compile time and avoid run-time crashes. They snapshot every successful build to train an in-house AI model, rewarding only code changes that compile and pass tests.
Jane Street had long skipped full-on formal methods despite using advanced type systems, but the rise of agent-driven coding cut proof costs and widened access. They’re now forming a team to integrate formal verification into their OCaml toolchain, tweaking the language and tapping their experienced user base while collaborating with external proof ecosystems.