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"content": "<p>“Hedge funds will go to great lengths in pursuit of <a href=\"https://ioc.exchange/tags/profits\" class=\"mention hashtag\" rel=\"tag\">#<span>profits</span></a>, whether it is by counting cars in satellite photos of parking lots or shipping gold across the Atlantic. Building a <a href=\"https://ioc.exchange/tags/compiler\" class=\"mention hashtag\" rel=\"tag\">#<span>compiler</span></a>—a piece of <a href=\"https://ioc.exchange/tags/software\" class=\"mention hashtag\" rel=\"tag\">#<span>software</span></a> that turns human-written code into programs a computer can execute—for your homegrown language? That still raises eyebrows.</p><p><a href=\"https://ioc.exchange/tags/JaneStreet\" class=\"mention hashtag\" rel=\"tag\">#<span>JaneStreet</span></a> is the quant shops’ quant shop, and it does just that, with great success. Last year its trading revenue almost doubled, to $21bn, putting it on a par with giants such as <a href=\"https://ioc.exchange/tags/Citigroup\" class=\"mention hashtag\" rel=\"tag\">#<span>Citigroup</span></a> and <a href=\"https://ioc.exchange/tags/MorganStanley\" class=\"mention hashtag\" rel=\"tag\">#<span>MorganStanley</span></a>. And the goose that lays the golden egg is its <a href=\"https://ioc.exchange/tags/tech\" class=\"mention hashtag\" rel=\"tag\">#<span>tech</span></a> system.</p><p>But it is what this system is built from that is really unusual. Other firms employ a hotchpotch of <a href=\"https://ioc.exchange/tags/ProgrammingLanguages\" class=\"mention hashtag\" rel=\"tag\">#<span>ProgrammingLanguages</span></a>, allowing staff to choose the right one for the job. At Jane Street almost everyone works in an obscure tongue developed by French academics: <a href=\"https://ioc.exchange/tags/OCaml\" class=\"mention hashtag\" rel=\"tag\">#<span>OCaml</span></a>. </p><p>Ask a <a href=\"https://ioc.exchange/tags/trader\" class=\"mention hashtag\" rel=\"tag\">#<span>trader</span></a> at the firm for its benefits and they will reel off a string of features, such as its support for <a href=\"https://ioc.exchange/tags/StaticTyping\" class=\"mention hashtag\" rel=\"tag\">#<span>StaticTyping</span></a> and <a href=\"https://ioc.exchange/tags/FunctionalProgramming\" class=\"mention hashtag\" rel=\"tag\">#<span>FunctionalProgramming</span></a>, that make it hard to learn but powerful when applied to a problem. The company says the language helps “maximise the <a href=\"https://ioc.exchange/tags/productivity\" class=\"mention hashtag\" rel=\"tag\">#<span>productivity</span></a> of each person we hire”.”</p><p><a href=\"https://ioc.exchange/tags/HedgeFunds\" class=\"mention hashtag\" rel=\"tag\">#<span>HedgeFunds</span></a> / <a href=\"https://ioc.exchange/tags/finance\" class=\"mention hashtag\" rel=\"tag\">#<span>finance</span></a> <<a href=\"https://www.economist.com/finance-and-economics/2025/06/26/jane-streets-sneaky-retention-tactic\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://www.</span><span class=\"ellipsis\">economist.com/finance-and-econ</span><span class=\"invisible\">omics/2025/06/26/jane-streets-sneaky-retention-tactic</span></a>> (paywall) / <<a href=\"https://archive.md/DQ0ku\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">archive.md/DQ0ku</span><span class=\"invisible\"></span></a>></p>",
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"en": "<p>“Hedge funds will go to great lengths in pursuit of <a href=\"https://ioc.exchange/tags/profits\" class=\"mention hashtag\" rel=\"tag\">#<span>profits</span></a>, whether it is by counting cars in satellite photos of parking lots or shipping gold across the Atlantic. Building a <a href=\"https://ioc.exchange/tags/compiler\" class=\"mention hashtag\" rel=\"tag\">#<span>compiler</span></a>—a piece of <a href=\"https://ioc.exchange/tags/software\" class=\"mention hashtag\" rel=\"tag\">#<span>software</span></a> that turns human-written code into programs a computer can execute—for your homegrown language? That still raises eyebrows.</p><p><a href=\"https://ioc.exchange/tags/JaneStreet\" class=\"mention hashtag\" rel=\"tag\">#<span>JaneStreet</span></a> is the quant shops’ quant shop, and it does just that, with great success. Last year its trading revenue almost doubled, to $21bn, putting it on a par with giants such as <a href=\"https://ioc.exchange/tags/Citigroup\" class=\"mention hashtag\" rel=\"tag\">#<span>Citigroup</span></a> and <a href=\"https://ioc.exchange/tags/MorganStanley\" class=\"mention hashtag\" rel=\"tag\">#<span>MorganStanley</span></a>. And the goose that lays the golden egg is its <a href=\"https://ioc.exchange/tags/tech\" class=\"mention hashtag\" rel=\"tag\">#<span>tech</span></a> system.</p><p>But it is what this system is built from that is really unusual. Other firms employ a hotchpotch of <a href=\"https://ioc.exchange/tags/ProgrammingLanguages\" class=\"mention hashtag\" rel=\"tag\">#<span>ProgrammingLanguages</span></a>, allowing staff to choose the right one for the job. At Jane Street almost everyone works in an obscure tongue developed by French academics: <a href=\"https://ioc.exchange/tags/OCaml\" class=\"mention hashtag\" rel=\"tag\">#<span>OCaml</span></a>. </p><p>Ask a <a href=\"https://ioc.exchange/tags/trader\" class=\"mention hashtag\" rel=\"tag\">#<span>trader</span></a> at the firm for its benefits and they will reel off a string of features, such as its support for <a href=\"https://ioc.exchange/tags/StaticTyping\" class=\"mention hashtag\" rel=\"tag\">#<span>StaticTyping</span></a> and <a href=\"https://ioc.exchange/tags/FunctionalProgramming\" class=\"mention hashtag\" rel=\"tag\">#<span>FunctionalProgramming</span></a>, that make it hard to learn but powerful when applied to a problem. The company says the language helps “maximise the <a href=\"https://ioc.exchange/tags/productivity\" class=\"mention hashtag\" rel=\"tag\">#<span>productivity</span></a> of each person we hire”.”</p><p><a href=\"https://ioc.exchange/tags/HedgeFunds\" class=\"mention hashtag\" rel=\"tag\">#<span>HedgeFunds</span></a> / <a href=\"https://ioc.exchange/tags/finance\" class=\"mention hashtag\" rel=\"tag\">#<span>finance</span></a> <<a href=\"https://www.economist.com/finance-and-economics/2025/06/26/jane-streets-sneaky-retention-tactic\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://www.</span><span class=\"ellipsis\">economist.com/finance-and-econ</span><span class=\"invisible\">omics/2025/06/26/jane-streets-sneaky-retention-tactic</span></a>> (paywall) / <<a href=\"https://archive.md/DQ0ku\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"\">archive.md/DQ0ku</span><span class=\"invisible\"></span></a>></p>"
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