Jane Street is a quantitative trading firm that uses technology and rigorous analysis to trade a wide range of financial products across global markets, handling billions of dollars in daily trading volume. The firm is known for its deep commitment to OCaml as a primary programming language, building sophisticated trading systems that must operate with extreme low latency and near-perfect reliability. Engineering at Jane Street means working on real-time market data processing, risk management systems, and trading infrastructure where correctness is paramount and bugs can have immediate financial consequences. The firm hires engineers who combine strong computer science fundamentals with intellectual curiosity, emphasizing functional programming, systems thinking, and the ability to reason about complex probabilistic systems under time pressure.
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