Machine Learning Engineer
About the job
- Be an undergraduate or PhD student with practical experience training a machine learning model, working on a machine learning library, or optimizing a machine learning workflow.
- Demonstrate strong programming ability.
- Have a curious, collaborative, and learning-oriented approach.
- Collaborate with full-time employee mentors on real-world machine learning projects.
- Work on projects involving machine learning experimentation, building new systems, and applying machine learning to noisy financial data.
- Use the company's GPU cluster and develop an understanding of the differences between textbook machine learning and its application to financial data.
About the company
Jane Street trades stocks, bonds, options, and exchange-traded funds with its own money as a market maker, a firm that constantly quotes prices to buy and sell so other investors can trade whenever they want. In 2025, it made more money from trading than JPMorgan Chase or Goldman Sachs, the biggest trading banks on Wall Street. Its traders, researchers, and engineers build computer-driven strategies that trade on exchanges and other venues around the world, and it also trades directly with large institutional clients. It earns the small gap between buying and selling prices across huge volumes, plus gains on positions it holds for minutes to days. Jane Street was founded in 2000 and is based in New York.
Company Size
1,001-5,000
Company Stage
Debt Financing
Total Funding
$90.4B
Headquarters
New York City, New York
Founded
2000
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Simplify's Take
What believers are saying
- Records keep falling: trading revenue hit $16.1 billion in the March 2026 quarter, more than double a year earlier.
- Staff share record profits: disclosures in May 2026 showed 2025 pay more than doubled to $9.4 billion, averaging $2.7 million.
- Pay starts high: October 2026 New York postings list a $300,000 base salary for new-grad engineers, traders and researchers.
What critics are saying
- Big bets backfired: Jane Street lost about $15 billion in July 2026 and told staff it would take less risk.
- India's manipulation case drags on: Jane Street's $567 million deposit stayed in escrow as hearings continued in October 2026.
- AI bills are locked in: cloud deals with CoreWeave and Crusoe, from April and September 2026, total about $19 billion.
What makes Jane Street unique
- It runs on a rare programming language: over 500 engineers write OCaml, and its codebase tops 30 million lines.
- ETF issuers depend on it: Jane Street handled nearly a quarter of US-listed ETF share creations and redemptions in 2024.
- It has never taken outside money: Jane Street's own capital grew to $45 billion in 2025.
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Benefits
Flexible Work Hours
Company News
Hudson River Trading hired an ex-Goldman Sachs MD for its growing venture capital arm. 38 minutes ago Want to work as a venture capitalist but not at a venture capital firm? In the past your best bet might have been to work in Goldman Sachs' elite 'principal strategic investments (PSI) group' which, as of 2019, had invested $1.5bn in 76 companies. Today VC is a space that electronic trading firms are breaking into, and one of the biggest has hired an alum of that elite team in London to help it grow. Matt O'Neill has joined Hudson River Trading in London as an investor with HRT Ventures. HRT's website says that it invests in "early-stage ventures seeking to influence capital markets, trading, and the broader financial landscape." The firm has been making venture investments since at least 2021 when it invested in investment platform Republic. Other investments include AI infrastructure firm Eridu and sports trading platform Sporttrade. O'Neill was most recently at another trading firm, Flow Traders, where he was global head of business development. He spent three years there, working on relationship management with banks alongside the firm's VC initiatives. Before that, he spent 14 years at Goldman Sachs across two separate stints, where he was an MD and helped set up the PSI group's Hong Kong business. He also spent five years at Morgan Stanley's equities clearing business. Jane Street has been getting involved in private markets too, most notably by acquiring a stake in Anthropic from FTX following its bankruptcy. The firm has used these investments as an opportunity to "expand [into] businesses that are more public facing" according to Jane Street trader John Case in an interview with the Wall Street Journal in June. The prevalence of trading firms in the VC space may also be influenced by the various trading firm alums who have built successful startups. HRT's first intern class famously included several major players in the AI space today including Meta chief AI officer Alexandr Wang, Cognition CEO Scott Wu and Hyperliquid founder Jeff Yan. O'Neill did not respond to a request for comment. Have a confidential story, tip, or comment you'd like to share? Contact: WhatsApp: http://wa.me/442079977910 (+44 20 7997 7910), Telegram: @AlexMcMurray, Signal: @AlexMcMurrayEFC.88 Click here to fill in our anonymous form, or email [email protected]. Bear with us if you leave a comment at the bottom of this article: comments are moderated intermittently by human beings. Sometimes these humans might be asleep, or away from their desks, so it may take a while for your comment to appear. You must take sole responsibility for comments you post on this site. We will take reasonable steps to weed out anything that we consider to be offensive or inappropriate. The essential daily roundup of news and analysis read by everyone from senior bankers and traders to new recruits. Boost your career. Find thousands of job opportunities by signing up to eFinancialCareers today. Top Articles
Jane Street hired Morgan Stanley's head of US rates sales. 10 hours ago Proprietary trading firms like Jane Street don't manage money on behalf of clients but that doesn't mean there isn't a place for salespeople. The electronic trading firm has a sizeable sales and trading division which "work[s] with top institutional investors and asset managers;" it just hired a top rates salesperson from Morgan Stanley to bolster that team. Lindsay Bofman, Morgan Stanley's head of US rates sales, announced that she is joining Jane Street's sales team in New York. Finra's BrokerCheck tool suggests that her last day at Morgan Stanley was last Friday, and that she hasn't officially started work at Jane Street yet. Bofman spent eight years at Morgan Stanley, making MD in 2021. Before that, she spent a decade with Barclays, also focused on interest rates sales, having started her career with Lehman Brothers in the summer of 2008. She's not the first sales MD from a bank to join Jane Street. Niamh Taylor, a former MD in prime and alternatives sales for JPMorgan, joined Jane Street in London at the start of last year to work on 'bank and broker management.' She was also previously hedge fund Schonfeld's head of EMEA. What exactly will Bofman be selling at Jane Street? The firm did not respond to a request for comment. Jane Street does much more than just algorithmic trading these days; for example, the FT reported earlier this month that the firm is now the biggest player in the Asian equities block trading space. Finra reports show that 'Jane Street Capital LLC' provides services to multiple major banks; it offers "clearance, custody and other services" to Bank of America, Goldman Sachs and JPMorgan while providing "prime brokerage services" to Wells Fargo, BNP Paribas and Cantor Fitzgerald. Have a confidential story, tip, or comment you'd like to share? Contact: WhatsApp: http://wa.me/442079977910 (+44 20 7997 7910), Telegram: @AlexMcMurray, Signal: @AlexMcMurrayEFC.88 Click here to fill in our anonymous form, or email [email protected]. Bear with us if you leave a comment at the bottom of this article: comments are moderated intermittently by human beings. Sometimes these humans might be asleep, or away from their desks, so it may take a while for your comment to appear. You must take sole responsibility for comments you post on this site. We will take reasonable steps to weed out anything that we consider to be offensive or inappropriate. The essential daily roundup of news and analysis read by everyone from senior bankers and traders to new recruits. Boost your career. Find thousands of job opportunities by signing up to eFinancialCareers today.
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If you can find some good data, hedge funds will hire you. 1 minute ago In March, we said that data strategists were hot. It's September and this is still so. Tudor Investment Corporation has just hired a new data strategist in London. He is Conor Taggart and he will seemingly be Tudor's data strategy lead. Tudor declined to comment. Taggart did not read our message. He appears to have arrived at Tudor recently. Data strategists source, evaluate, clean and render into usable formats, data that might be used for hedge funds to generate alpha. Good data is very valuable. Good data strategists are in demand. Before he worked for Tudor, Taggart worked for Eagle Alpha. Before he worked for Eagle Alpha, he worked for Millennium. Various other data strategists have also swapped jobs this year. Dan Ostermueller arrived at Jane Street in July after previously working for Citadel. Kevin Chiu arrived at Tower Research in August, after previously working for BlackRock. Adam Brown arrived at Jump Trading, also in August, after previously working for Morgan Stanley. Rokos hired Meredith Brown in New York as a macro data strategist in July. Quants can work in data strategy too. In Citadel's large data strategy team, for example, there are quant researchers who describe their function as, turning "noisy data into outputs that are intuitive, timely and directly usable." Follow me on X. Follow me on LinkedIn. Have a confidential story, tip, or comment you'd like to share? Contact: +44 7537 182250 (SMS, Whatsapp or voicemail). Telegram: @SarahButcher. Signal: sarahbutcher.22 Click here to fill in our anonymous form, or email [email protected]. Bear with us if you leave a comment at the bottom of this article: comments are moderated intermittently by human beings. Sometimes these humans might be asleep, or away from their desks, so it may take a while for your comment to appear. You must take sole responsibility for comments you post on this site. We will take reasonable steps to weed out anything that we consider to be offensive or inappropriate. The essential daily roundup of news and analysis read by everyone from senior bankers and traders to new recruits. Boost your career. Find thousands of job opportunities by signing up to eFinancialCareers today. Top Articles
Oxford dropout and two Fluidstack co-founders become billionaires after AI startup reaches $18B valuation. Jamie Cox, an Oxford University dropout, and his fellow Fluidstack co-founders Gary Wu and Cesar Maklary have become billionaires after their AI infrastructure startup was valued at more than US$18 billion. Fluidstack recently closed a previously unreported US$1.5 billion funding round led by quantitative trading firm Jane Street, Forbes reported on Sept. 3, citing people familiar with the deal. The financing more than doubled the company's valuation from US$7.5 billion earlier this year and pushed the fortunes of Wu, 31, Cox, 29, and Maklary, 29, into billionaire territory. Based on corporate filings detailing their ownership stakes, the three would have ranked among Europe's youngest self-made billionaires had Fluidstack remained headquartered in Britain. The company is now based in New York. At its current valuation, Fluidstack would also rival German defense technology firm Helsing, valued at US$18 billion in July, as one of Europe's most valuable AI startups. | Cesar Maklary, Jamie Cox and Gary Wu, co-founders of AI infrastructure startup Fluidstack. Photo from LinkedIn | Fluidstack's origins date back to Oxford University, where Cox, then studying classics, met Wu, an economics student. The pair founded the company in 2017 after noticing that AI researchers often struggled to access computing power while high-performance graphics processing units, or GPUs, owned by gamers frequently sat idle. Cox dropped out of Oxford the following year and became a Thiel Fellow, joining a program created by billionaire investor Peter Thiel to support young people pursuing projects outside traditional education. Maklary, who had previously worked in aerodynamics for a Formula One team, joined Fluidstack in 2020. The startup initially operated as a marketplace connecting owners of unused GPUs with AI researchers seeking computing capacity. During the Covid-19 pandemic, it shifted toward renting larger pools of GPUs from companies and university laboratories. Demand surged after the launch of ChatGPT triggered a boom in AI computing infrastructure. Fluidstack's revenue rose from US$1.8 million in 2022 to US$30 million in 2023 and US$66.2 million in 2024. It has since expanded into building and operating large-scale AI infrastructure for customers including Meta, Mistral, Poolside and Black Forest Labs. The company gained wider attention in February 2025 when French President Emmanuel Macron announced plans for Fluidstack to develop a €10 billion (US$11.5 billion), one-gigawatt AI data center in northern France. Fluidstack later withdrew from the project as it shifted its focus toward the U.S. after securing larger contracts there, Bloomberg reported. Its biggest expansion has come through Anthropic, the developer of AI chatbot Claude. Anthropic announced a US$50 billion investment in U.S. computing infrastructure in November and selected Fluidstack to build custom data centers in New York and Texas. Fluidstack is also involved in Anthropic's planned deployment of up to one million Google Tensor Processing Units, or TPUs, specialized chips designed for AI workloads. By building infrastructure for the project, Fluidstack appears to be the first publicly known operator of TPU data centers outside Google itself, according to Forbes. An investor report projects that Fluidstack will manage up to 1.3 gigawatts of capacity across more than 10 sites this year, while revenue is expected to reach US$660 million, more than triple the US$200 million projected for 2025. The startup has hired more than a dozen former Tesla and SpaceX employees over the past year, according to LinkedIn updates. Fluidstack has also told prospective employees that it aims to secure 50 gigawatts of power capacity by 2030. One job listing says the company intends to sign more computing capacity this decade than any other company.