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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 runs its trading systems almost entirely on OCaml, betting on compile-time type checking (e.g., mandatory Option handling) to prevent costly runtime bugs.
- They rejected off-the-shelf tools like Copilot and Claude in favor of an in-house AI model trained on their own workspace snapshots.
- Developer workspaces are snapshotted every 20 seconds, and reinforcement learning rewards only edits that compile and pass tests.
- This snapshot-trained system underpins infrastructure supporting roughly $40 billion in annual trading volume.