Jane Street

Machine Learning Performance Engineer role focused on optimizing the performance of ML models for both training and inference. Requires deep low-level systems programming and GPU knowledge, debugging skills, and experience with ML libraries and distributed training.

Machine Learning Engineer at Jane Street to drive the direction of their ML platform, focusing on building and maintaining training and inference infrastructure, enhancing research workflows, and applying ML to financial trading. Requires strong mathematical foundations and experience with ML frameworks.

This role focuses on network analysis and support, with an emphasis on building automation and DevOps-driven solutions. The analyst will enhance existing workflows, streamline processes, and ensure network stability, security, and adaptability. Key responsibilities include diagnosing and resolving network issues, supporting site expansions, maintaining monitoring systems, and using scripting/development tools for automation and AI integration.

Senior Network Engineer to scale networks, drive standardization through automation, and explore AI/ML for operational improvements in a multi-vendor, highly available network infrastructure supporting distributed systems and high-speed trading.

Cybersecurity Engineer to protect company's people, data, and infrastructure. Responsibilities include firm-wide defenses, providing expertise, leading employee awareness efforts, and handling event analysis and incident response.

Jane Street is hiring an ASIC Physical Design Engineer to join their Ultra Low Latency team. This role involves designing, testing, and deploying advanced hardware, with an emphasis on owning the physical design flow end-to-end while also having the ability to read/write RTL and understand cross-functional design decisions. The team utilizes Hardcaml, a hardware development toolchain embedded in OCaml, and seeks engineers interested in improving hardware design processes with software engineering techniques.

Logistics Coordinator role focused on managing equipment inventory, delivery, installation, and deployment for offices, data centers, and co-locations, with responsibilities including logistics planning, call-off process management, installation coordination, inventory level management, asset transfers, customs broking, and process improvements. Requires 5+ years of experience in logistics and project management, preferably in IT or data center environments, with strong communication and problem-solving skills.

Data Centre Engineer responsible for designing, building, scaling, and maintaining data centre infrastructure, including hardware, cabling, and network equipment, ensuring security, organization, and operational efficiency.

Seeking a Dividend Trader in London to trade index and single stock dividend futures, manage dividend exposure, and grow European dividend trading capabilities. Requires 3+ years of dividend trading experience, strong quantitative skills, and Python programming is preferred.

Qualified Accountant to join Financial Reporting team, responsible for maintaining books and records for European businesses, preparing financial statements, and collaborating with accounting teams globally. Role involves preparing reconciliations, supporting financial statements, working with auditors, and documenting policies. Opportunity to improve and automate processes with the accounting-specific Technology team.

Identity Security Engineer with a strong background in engineering hybrid Windows platforms, focusing on securing access to IT platforms, implementing security controls, identifying security gaps, and providing technical leadership for cloud adoption.

Operations Specialist role at Jane Street focused on managing trade settlements, trade record and position management, or cost and cash management. Requires working with large datasets to find patterns and irregularities, and improving data processing efficiency. No prior finance experience needed, emphasis on learning and critical thinking.

Seeking an experienced ASIC Engineer to design, test, and deploy advanced hardware designs for the Ultra Low Latency team. The role involves collaboration across trading, networking, and research infrastructure, with opportunities to work on both FPGA and ASIC technologies. Experience with RTL design, verification, and ASIC design flows (Synopsys or Cadence) is required. Familiarity with software engineering techniques and high-level programming languages is a plus.

IT Security Engineer with a strong Windows engineering background and practical exposure to modern platform security controls. Responsibilities include proposing, designing, testing, implementing, and documenting strategic security controls, coordinating security solutions, identifying opportunities to automate workflows, securing internal IT and remote working platforms, building scalable security controls, investigating emerging threats, developing new security tooling, and driving vulnerability management initiatives. The role requires proficiency in securing Windows OS platforms, hands-on experience with integrated security technologies, skills in administering endpoint security and vulnerability management solutions, knowledge of security best practices, understanding of common threat tactics, techniques, and procedures, familiarity with Windows core infrastructure services, and proven experience automating workflows in PowerShell or other scripting languages.

Jane Street is seeking an experienced educator to develop and deliver courses on OxCaml, a specialized branch of OCaml, to internal engineers. The role involves creating educational materials, teaching new hires and experienced developers, and mentoring other educators, while also contributing to the development of OxCaml through coding.

Cybersecurity Analyst role focused on protecting company infrastructure, data, and employees by developing monitoring tools, handling incident response, and promoting best practices. Requires strong programming skills, threat modeling knowledge, and the ability to communicate technical concepts to stakeholders.

Software Engineers to design and build systems and tools for a financial firm, covering trading, accounting, and infrastructure. Experience with OCaml and Python is mentioned, with Python being vital for data analysis, visualization, and machine learning.

Jane Street is seeking a Trading Desk Operations Engineer to manage and optimize desk infrastructure, support trading systems, execute data queries, and coordinate with stakeholders to ensure accuracy and efficiency in a fast-paced financial environment. The role involves building tools for smooth firm operations and efficient trade execution, requiring strong technical, organizational, and problem-solving skills.

Jane Street is seeking Linux Engineers to maintain and improve the critical infrastructure for their production trading systems. This role involves debugging kernel performance, developing management tools, resolving production issues, and focusing on deployment automation, configuration management, and monitoring. The position is open to individuals with a strong problem-solving aptitude and a willingness to learn OCaml, with opportunities for hands-on training.

Seeking an Engineer with software and hardware design experience to build FPGA-based applications. The role involves using OCaml & Hardcaml for RTL design and testing, with exposure to Verilog and C. Focus is on improving hardware design and testing tools.

Hands-on Cybersecurity Engineer focused on threat modeling, vulnerability remediation, and guiding teams to build security into applications. Combines offensive security expertise with strong communication and problem-solving skills to improve the firm's security posture.

Seeking an experienced engineer with a strong background in mobile device management (MDM) and remote device solutions to engineer, manage, and maintain a fleet of thousands of iOS and Android devices. Responsibilities include improving, automating, and standardizing device management, developing PowerShell scripts, optimizing MDM systems, and collaborating globally to resolve issues, deploy updates, and enhance systems. The role also involves developing new solutions, architecting integrations, and documenting problem resolution.

Jane Street is seeking a Cybersecurity Governance and Risk Specialist to enhance and champion cybersecurity GRC activities. The role involves collaborating with cross-functional teams to improve governance and risk management, developing policies, monitoring compliance and regulatory requirements, performing control assessments, and conducting third-party vendor assessments. The ideal candidate has experience in technical environments, understands cybersecurity standards and regulatory requirements beyond finance, and is familiar with auditing processes.

Seeking an experienced Software Engineer with a background in programming languages to join the OCaml Language team. The role involves improving OCaml's type system, optimizer, and toolchain to enhance developer productivity and code performance. The work is largely open-source.

Data Engineer at Jane Street to transform messy real-world datasets into reliable inputs for research and trading. Responsibilities include working with trading desks to identify data needs, evaluating datasets, building pipelines for ingestion and transformation, and shaping systems. Requires strong programming skills, SQL/DataFrame proficiency, intellectual curiosity, and clear communication.

Jane Street is seeking a Market Data Specialist to join their Metadata team in London. This role focuses on enhancing and maintaining the firm's Security Master and Corporate Action Management systems. Responsibilities include configuring systems for data quality, data cleaning and validation, resolving internal client support issues, and liaising with data providers. The specialist will collaborate with software developers, traders, and operations professionals.

Seeking a Linux Engineering Manager to lead a team responsible for maintaining and improving the platform powering Jane Street's production trading systems. The role involves both individual technical contributions and people management, with an emphasis on leadership by example, problem-solving, and collaboration.

Technical Programme Manager to provide organisation and coordination support for engineering initiatives in a fintech trading technology company. The role involves leading projects through their lifecycle, managing timelines, risks, and communication across teams, and contributing to the design, deployment, and support of trading infrastructure. Requires strong technical background, communication skills, strategic thinking, and comfort with ambiguity.

Experienced Network Engineer to join the Network Security team, focusing on running, scaling, and improving network security infrastructure. Responsibilities include hands-on operations, design, implementation, managing network segmentation, evaluating new platforms, collaborating on threat mitigation, and enhancing observability. Requires strong networking fundamentals and experience with security appliances.

Software engineer focused on front-end development, UI design, and typed functional programming for trading infrastructure tools. The role involves designing and implementing next-generation browser-based tools for expert users, maintaining a high UX bar, and creating flexible, powerful tools. Opportunities exist to develop libraries, abstractions, and improve firm-wide UI development practices. Requires strong web technology background (CSS, DOM, UI frameworks), practical experience with sophisticated UIs, and an interest in typed functional programming (Elm, ReasonML, Purescript, Typescript are a plus). The role may involve working across the stack (front-end, back-end, middleware, databases) and collaborating with traders. Fluency in English is required.

This role focuses on maintaining and improving the critical Linux infrastructure that powers Jane Street's production trading systems. Responsibilities include debugging kernel performance, developing management tools, resolving production issues, and implementing deployment automation, configuration management, and monitoring. The ideal candidate has deep knowledge of Unix internals, Linux systems, and systems programming concepts.

Jane Street is hiring Production Engineers in London. This role involves both software development and providing support for critical trading systems. Production Engineers work embedded in software teams or in standalone teams, collaborating with application developers. The role emphasizes functional programming, OCaml, and solving real-time issues to make a firm-wide impact. They own the architecture and design of monitoring and support systems, and develop their own tools. The role requires strong programming skills, intellectual curiosity, and excellent communication, especially during production incidents.

Seeking an engineer to manage and automate internal Windows infrastructure, including servers and desktops, focusing on performance and reliability. Requires scripting experience (PowerShell, Python, C#) and collaboration within a global IT Engineering team.

Software Engineer role at Jane Street, a trading firm that uses technology at the core of its operations. The role involves using OCaml and Python for data analysis, visualization, and machine learning. The company values open source and collaboration. No prior experience in functional programming, OCaml, Python, or finance is expected, as training is provided.