Machine Learning Researcher at Jane Street | London

Join Our Team as a Quantitative ResearcherAt Jane Street, we are seeking talented Quantitative Researchers to develop advanced models, strategies, and systems for pricing and trading financial instruments. Your expertise in experimental design, dataset generation, time series analysis, feature engineering, and model building will be pivotal in harnessing financial datasets. Collaborate with a dynamic team of experts who will challenge your ideas and refine your methodologies.Our collaborative environment places researchers, engineers, and traders in close proximity, allowing for seamless teamwork in training models, architecting systems, and executing trading strategies. We handle vast amounts of data and leverage an expansive GPU cluster with tens of thousands of high-performance GPUs. Daily tasks may involve deep analysis of market data, fine-tuning hyperparameters, enhancing distributed training performance, or understanding how our models perform in live trading.We embrace a diverse range of statistical and machine learning techniques, from linear models to deep learning, tailoring our approach to meet the unique challenges we face. The most successful researchers are those who possess a deep curiosity about how their work contributes to our overarching trading operations and adapt their insights into actionable strategies.

About the Role Jane Street is seeking enthusiastic Quantitative Researchers to join our dynamic team. In this role, you will collaborate closely with seasoned researchers to develop sophisticated models, strategies, and systems aimed at pricing and trading financial instruments. You will gain valuable insights into experiment design, dataset generation, time series analysis, feature engineering, and model building tailored for financial datasets. Our unique environment fosters collaboration between researchers, engineers, and traders, allowing for seamless interaction as we train models, architect systems, and execute trading strategies. With access to petabytes of data, a robust computing cluster featuring hundreds of thousands of cores, and an expanding GPU cluster housing tens of thousands of high-performance GPUs, you will engage in a wide range of activities—from analyzing market data and optimizing hyperparameters to debugging distributed training performance and evaluating our models' trading behavior in real-time. At Jane Street, we embrace diverse modeling approaches, prioritizing the application of various statistical and machine learning techniques, from linear models to deep learning, depending on the challenge at hand. Our most successful researchers possess a keen curiosity about how their contributions integrate into our broader trading operations and how to translate their findings into actionable strategies.

About the Role At Jane Street, our quantitative traders excel in identifying market signals, analyzing and executing strategies, and constructing sophisticated quantitative models. You will conduct statistical analyses, build algorithmic trading systems, manage risk, and contribute to the development of new business initiatives. Our trading desks are integral to our collaborative and cooperative office culture. You will work closely with seasoned traders committed to mentoring and supporting our new team members. Through interactive, hands-on training, you’ll take on significant trading responsibilities within weeks to months of joining our team, complemented by a comprehensive year-long educational curriculum across the firm. At Jane Street, we intentionally blur the lines between research, technology, and trading. As our strategies become increasingly sophisticated, collaboration is vital to push the boundaries of what we can achieve. We leverage petabytes of data, operate a computing cluster with hundreds of thousands of cores, and maintain a growing GPU cluster featuring thousands of high-end GPUs. We embrace a diversity of statistical and machine learning techniques, from linear models to deep learning, tailored to fit the specific challenges we face.

About the Position As a Quantitative Trader at Jane Street, you will be part of a dynamic team that leverages proprietary models to execute over a million trades on busy days. Our traders collaborate to identify and capitalize on pricing inefficiencies, develop innovative models, manage risk, explore new products, and expand into emerging business areas. Experienced traders mentor and guide their less-experienced colleagues, allowing new traders to grow into their roles with increasing responsibility. At Jane Street, technology is integral to our trading strategy. We pride ourselves on being as much a technology firm as a trading company. Our primary programming language is OCaml, a statically-typed functional programming language, and we boast the largest team of OCaml engineers in any industrial context.

About the Position We are seeking intelligent and inquisitive individuals to enhance our dynamic Machine Learning team at Jane Street. This role offers the opportunity to develop cutting-edge deep learning models that underpin our trading strategies, utilizing our expansive computing cluster equipped with tens of thousands of high-performance GPUs. The trading environment presents unique challenges, including large-scale models and nonstationary datasets within a competitive multi-agent landscape, prompting innovative solutions. At Jane Street, our researchers, engineers, and traders collaborate closely, sharing knowledge and expertise just a few feet apart. Your day may involve analyzing market data, optimizing hyperparameters, diagnosing distributed training performance, or exploring our models' behaviors in live trading scenarios. Your extensive knowledge of the machine learning domain and familiarity with diverse methodologies—ranging from LLMs, image recognition systems, RL agents, recommendation frameworks, to classical ML techniques—will be invaluable in advancing ML at Jane Street. You will play a crucial role in training models for our next-generation deep learning trading strategies and developing the insights necessary to navigate new markets and challenges. Furthermore, you will be involved in the recruitment of new team members, attending industry conferences, and sharing your expertise with colleagues, all of which are considered significant contributions to our mission.

About the RoleAt Jane Street, we are diligently working on OxCaml, an enhanced branch of OCaml designed to optimize performance engineering. However, creating and implementing the language is just part of the journey; we need our developers to master its intricacies and utilize OxCaml like true professionals. That’s where you come in.We are on the lookout for a talented and experienced educator to assist us in developing educational materials and delivering comprehensive courses aimed at teaching our engineers to effectively harness the power of OxCaml. You will engage widely within our internal educational framework, from enhancing our OCaml Bootcamp for new hires to crafting specialized tutorials that empower seasoned developers to leverage OxCaml’s most advanced capabilities.This is a remarkable opportunity to collaborate closely with the designers and implementers of the language in building its educational framework. You will be an integral part of the Jane Street team, shaping the future of OxCaml.

About the Position Jane Street is seeking a dedicated Cybersecurity Analyst to join our London office, playing a crucial role in safeguarding our employees, data, and infrastructure from online threats. As a Cybersecurity Analyst, you will be responsible for developing and utilizing monitoring tools to protect our firm, as well as managing incident response and remediation when threats are detected. Our Cybersecurity team consists of talented programmers and security professionals committed to maintaining the safety of our organization. We pride ourselves on staying abreast of the latest developments in the cybersecurity landscape, distinguishing between notable hacks by security researchers and the critical issues that impact our daily operations. In this position, you'll be expected to thoughtfully assess the context of our decisions, weighing the trade-offs in our approach to resolving cybersecurity challenges. You will employ a systematic methodology to conduct unstructured investigations, identifying and rectifying the root causes of security incidents. Additionally, you will serve as an ambassador of cybersecurity best practices within the firm. Our team members are encouraged to understand and implement good personal cybersecurity hygiene and communicate effectively about it with others. A significant aspect of success in this role involves bringing your colleagues along on the cybersecurity journey, fostering an environment of learning and collaboration.

About the PositionAs a Linux Engineer at Jane Street, you will be integral to the vital infrastructure that supports our technology landscape. Our team comprises dedicated Systems Engineers, Administrators, and Programmers focused on maintaining and enhancing the platform that drives our production trading systems. Our unique blend of in-house and open-source software empowers you to explore and innovate at every level. Each day presents opportunities to debug kernel performance, develop management tools, or tackle production issues in real time. We thrive on solving complex systems challenges.Our ongoing projects emphasize deployment automation, scalable configuration management, and meticulous monitoring. While we automate as much as possible, it's not out of laziness. We believe that automation minimizes errors and reduces workloads, not to mention that it adds an element of enjoyment to our tasks.Being part of our group opens avenues to collaborate with various departments across the company. We engage directly with colleagues in Trading, Technology, and Operations to design and maintain systems that have a company-wide impact. Utilizing feedback from other teams and our tailored monitoring tools, we aim to swiftly resolve production issues, conduct thorough root-cause analyses, and implement long-term solutions in a clean and robust manner.

About the Position Jane Street is seeking an experienced UK Tax Lawyer to join our London office, where you will play a vital role in tax structuring and advisory. You will be instrumental in managing tax implications and structural considerations for internal restructurings, including investment frameworks for senior group members and complex transactions such as acquisitions and dispositions. Your expertise will also extend to structuring and advisory matters related to the firm's trading activities. This position offers you the chance to collaborate closely with our local and global Tax team as well as with various professionals across the organization, making it an exciting opportunity to engage with a dynamic and entrepreneurial work environment. The ideal candidate will be commercially driven, exceptionally comfortable with numerical data, highly collaborative, and thrive under tight deadlines.

About the RoleJane Street is seeking a skilled Data Engineer to enhance our understanding, management, and dissemination of data that informs our trading strategies. At Jane Street, the ability to comprehend and manipulate data accurately is fundamental to our operations.In this role, you will utilize a combination of proprietary and open-source tools to analyze diverse datasets, identifying anomalies, ensuring consistency in formats and symbologies, automating ETL processes, and ultimately simplifying the process for our traders to derive insightful conclusions.We are looking for someone who is passionate about diving deep into data and articulating findings to various stakeholders, collaborating closely with traders and software engineers.While familiarity with financial data is beneficial, we do not require a financial background. We are eager to hire talented engineers and provide the necessary training.

About the Position Jane Street is seeking a talented FPGA Engineer with a strong foundation in both software and hardware design to join our innovative team. In this role, you will play a pivotal part in developing our cutting-edge FPGA-based applications. We are passionate about leveraging tools to enhance programming efficiency, enjoyment, and reliability. We apply these principles within our FPGA Engineering endeavors, and we invite individuals who are keen on utilizing programming language technology to elevate the design, testing, and validation of hardware designs. Our development environment heavily incorporates Hardcaml, an OCaml library designed for succinct hardware description in RTL. Familiarity with Hardcaml is not a prerequisite. As an FPGA Engineer, you will engage in designing and implementing new FPGA applications from the ground up, as well as improving our internal high-level design and testing tools. Your daily responsibilities will primarily involve working with OCaml and Hardcaml for RTL design and testing/integration, while also occasionally utilizing Verilog and C. While prior experience with OCaml is not necessary, a solid understanding of typed programming languages will be beneficial. If you're interested in learning more about our interview process, feel free to explore our interview guide, meet some of our newest hires, or check out our OCaml All The Way Down talk as well as the Programmable Hardware podcast.

About the Role We are seeking talented Production Engineers to join our London office. At Jane Street, Production Engineers are skilled software developers who engage in both software development and provide essential support for critical software systems integral to our trading operations. Our Production Engineers are often embedded within various software teams, while others work in dedicated teams. In both scenarios, we collaborate closely with application developers, all aiming to create and maintain outstanding software systems. We strongly advocate for functional programming and primarily utilize OCaml as our development language. As a Production Engineer, you will play a vital role by interacting with diverse departments and functions across Jane Street. You will tackle real-time challenges and make a significant impact across the firm. You will take ownership of the design and architecture of systems that monitor and support our trading activities. Additionally, you will design and develop the tools we utilize, allowing you to influence their evolution positively. If you wish to explore more, visit Production Engineering at Jane Street.

About the RoleThe Operations team plays a pivotal role in the trading activities at Jane Street. We oversee the processes that connect us with external partners as well as those that facilitate internal collaboration. Our objective is to ensure the seamless movement of assets, information, and ideas with precision, control, and efficiency. The challenges we face are substantial, and we strongly believe in recruiting exceptional, intelligent individuals to address them.Our Operations team is collaborative and integrated, thriving in a dynamic environment where the best ideas prevail. As a key member of our team, you will focus on trade settlements, trade record and position management, or cost and cash management. You will collaborate closely with external service providers and trading partners, as well as colleagues locally and globally. Together, you will tackle issues arising from our complex trading flows and ensure our processes run smoothly.If you have never considered a career in finance, you’ll fit right in as many of our team members began their journeys in finance at Jane Street. We prioritize how you think and learn. You will engage with a diverse range of financial products including equities, bonds, ETFs, futures, and swaps, regardless of your prior knowledge or experience. We seek bright, eager learners from Day One.

About the RoleJane Street is seeking a passionate and proactive Technical Product Manager to provide organizational and coordination support for our dynamic engineering initiatives. As technology is at the heart of our business operations, this position presents a unique opportunity to collaborate closely with our engineering team as we enhance and optimize Jane Street's trading technology.In this role, you will leverage your technical expertise daily, guiding projects from inception through completion. This includes setting objectives, developing timelines, tracking progress, managing developer resources, identifying potential risks, and liaising with cross-functional teams. You will also communicate project schedules, priorities, and updates to the wider organization.Exceptional communication skills and the capacity to juggle multiple priorities are essential for successful collaboration with various teams at Jane Street—including developers, business units, operations, and support—as well as external financial entities. Your goal will be to ensure that projects are delivered punctually and meet or surpass established goals and expectations.We foster a flexible problem-solving environment that inspires innovative thinking when developing processes and tools for each project. The successful candidate will be a strategic thinker who aligns with the team's and project's objectives when tackling challenges.This position is part of Jane Street's technology group, which designs, implements, and supports the vital infrastructure supporting our trading activities. The scope of our systems is extensive, providing insight into a broad array of global markets as you work to enhance them. To thrive in this role, you should enjoy working autonomously within small teams, adapting quickly to new information, and making impactful decisions for the firm.At Jane Street, the “P” in TPM encompasses various roles. Depending on the team, individual, and specific circumstances, you may find yourself functioning anywhere along the spectrum from Product Manager to Program Manager. Thus, you will excel at Jane Street if you are comfortable with ambiguity and eager to engage with the task at hand, applying your relevant skills, whether through extensive program management and coordination, product vision, or business context. This is also why you will find a corresponding job posting for “Technical Program Manager” elsewhere on our site that mirrors this one—feel free to apply to whichever role aligns better with your experience and interests, and we will ensure your application is directed to the appropriate pipeline.

About the Role Jane Street is seeking talented Software Engineers who are eager to contribute to the design and development of the systems and tools that drive our operations. Our Software Engineers are integrated throughout the company, tackling complex challenges that span from trading desks to accounting, as well as creating essential infrastructure, including network monitoring solutions and risk models. We are strong advocates of functional programming, primarily utilizing OCaml, a statically-typed functional programming language. Recently, Python has emerged as a crucial component in our research and trading initiatives, serving as the primary language for data analysis, visualization, and machine learning. In addition to our internal practices, we value the significance of open-source software. We actively incorporate it into our daily operations and have released over a million lines of our code as open source. We are continually looking for ways to enhance open-source projects and provide ongoing support for tools like Mercurial, the OCaml compiler, and the OPAM package manager. We welcome passionate engineers with experience in any programming language; most of our team members started with minimal practical knowledge of OCaml. To learn more about our interview process and meet some of our newest hires, feel free to explore.

About the PositionJane Street is seeking a talented and experienced ASIC Engineer to join our Ultra Low Latency team, where you will play a pivotal role in designing, testing, and deploying cutting-edge hardware solutions. In this collaborative environment, you will work closely with various teams across the firm, including trading, networking, and research infrastructure. We value versatility and are looking for someone comfortable with both FPGA and ASIC technologies.We believe in the transformative power of tools to enhance productivity, reliability, and enjoyment in hardware engineering. That's why we developed Hardcaml, a hardware development toolchain integrated with OCaml. While prior knowledge of OCaml is not a prerequisite (we will provide training), we seek hardware engineers who are enthusiastic about leveraging superior tools and are open to exploring innovative approaches.

About the RoleJoin our dynamic team as a Programming Language Engineer, where your expertise in software engineering and programming languages will be pivotal to our growth. At Jane Street, we are dedicated to enhancing OCaml, which serves as a crucial component of our extensive technology stack. By collaborating with the broader OCaml community, we strive to refine various aspects of the language, making it easier for developers to articulate their ideas, optimize code performance, and enhance the usability of the OCaml compiler.Our ongoing projects include extending the type system to incorporate innovative language features, completely re-engineering the optimizer, and implementing feedback-directed optimization strategies. We also focus on enriching the toolchain by developing tools for profiling, debugging, and generating documentation. A significant portion of our contributions is open-source, and we actively upstream enhancements to the mainstream OCaml compiler.

Position Overview Jane Street is seeking a talented and qualified Financial Reporting Accountant to join our dynamic Financial Reporting team. In this role, you will be responsible for maintaining the financial books and records for our European operations and preparing accurate monthly and annual financial statements in collaboration with regional and global accounting teams. Your key responsibilities will include: Preparing and reviewing various accounting reconciliations and financial schedules that underpin our financial statements. Collaborating with external auditors and advisors, interpreting GAAP, and documenting accounting policies and internal controls. Working closely with our accounting-focused Technology team to streamline and automate processes for greater efficiency. At Jane Street, we thrive on finding innovative solutions to complex challenges. Our legal and regulatory landscape is ever-evolving, and we are looking for a self-motivated individual who pays meticulous attention to detail and deadlines, and is ready to dive into our fast-paced work environment.

About the PositionJoin our dynamic team as a Network Analyst, where you will play a crucial role in developing automation and DevOps-driven solutions while harnessing the potential of AI. You will be instrumental in supporting our global network infrastructure, which services various traffic profiles, from high-speed trading to extensive internet connectivity.In this position, you will collaborate with senior engineers and developers to refine existing workflows, optimize processes, and ensure our network's stability, security, and adaptability. We are looking for candidates who are passionate about solving complex challenges and eager to deepen their skills in operations and innovative infrastructure engineering.Your typical day will involve:Providing hands-on support to troubleshoot and resolve network issues across LAN, WAN, and colocation environments.Collaborating with project managers on site expansions, integrating new market data feeds, and establishing connections to third-party services.Enhancing our monitoring and alert systems with a focus on automation, AI integration, and DevOps methodologies.Utilizing scripting or development tools to minimize manual tasks, increase network visibility, and explore cutting-edge AI-driven solutions.This role offers an incredible opportunity to learn from experienced network engineers using state-of-the-art hardware, protocols, and DevOps tools. Your contributions to automation, AI integration, and innovative tooling will significantly impact our operational excellence and shape the future of our network.