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Jane Street Group, LLC has openings for Senior Software Engineers - multiple openings in New York, NY. The position duties are as follows: Develop software in OCaml as part of the trading and operational infrastructure for a proprietary trading company. Support traders and other users of the company’s technology infrastructure on both Linux and Windows platforms. Analyze and respond in real-time to problems arising from the firm’s technological infrastructure. Work in all parts of the software lifecycle, including gathering requirements, design, documentation, management of code review, creation of testing plans, as well as implementation and management of deployment and monitoring of the resulting software systems. Train junior developers in all of the above. Part-time telecommuting may be permitted with manager approval.