Jane Street was founded in 2000 and is a global liquidity provider, trading mostly products listed on exchanges. They have offices in New York, London and Tokyo, and trade over $8 billion in equities worldwide, and over a million trades per day.
Jane Street is built on open source, and they write and use large amounts of OCaml code. Open source libraries that they have released include:
- Core: industrial-strength alternative to OCaml's standard library
- Core_extended: useful extension set for Core
- Async: monadic concurrency library
- Sexplib and Bin_prot: syntax extensions for extending the OCaml language
OCaml as the primary development language for Jane Street was a decision made based on a need for high performance, a powerful type system with static analysis tools that allow you to catch bugs at the earliest stage possible. OCaml is a highly expressive functional programming language allowing for the clear and precise declaration of ideas.