Jobs at Jane Street

Work alongside full-time ML researchers on end-to-end projects applying state-of-the-art models to large, nonstationary market datasets. Tasks include data exploration, model development, hyperparameter tuning, debugging training, and analyzing model predictions using large-scale compute and GPU resources. Internship-focused, with heavy emphasis on practical ML implementation and iteration.

Design and build internal systems and tools across the firm, from trading desks to accounting. Implement foundational infrastructure (monitoring, risk models), work with OCaml and Python, contribute to and leverage open source, and solve critical, production-facing engineering problems.

The Commercial Contracts Attorney will review and negotiate contracts, support procurement processes, and advise teams on legal matters related to commercial contracts.

Build a Formal Methods team to develop practical tools that apply proof assistants, theorem provers, static analysis, and related techniques to validate agent-generated code and integrate those tools across the firm.

Protect firm employees, data, and infrastructure by developing and using monitoring tools, performing incident response and remediation, conducting unstructured investigations, and promoting cybersecurity best practices across the organization.

The IT Operations Engineer will support, configure and maintain systems across various platforms, respond to support requests, and optimize operations using automation tools.

The Cybersecurity Engineer will protect company infrastructure, lead cybersecurity awareness efforts, handle incident responses, and collaborate on security practices.

Build and grow a Formal Methods team to develop practical tooling that verifies and validates agent-generated code. Combine deep formal-methods research (proof assistants, theorem provers, static analysis, refinement types, program logics) with strong software engineering to create tools used across the firm.

Work alongside quantitative researchers to identify market signals, analyze large financial datasets, design and test models, and develop trading strategies. Participate in classes, seminars, and collaborate on end-to-end strategy production, including experiment design, feature engineering, and model validation.

Mentored software engineering internship building real production-quality systems. Work primarily uses OCaml (some teams use Python). Interns collaborate with full-time engineers on projects ranging from high-performance trading systems to programming language design, focusing on learning, maintainable code, and practical software development.

We seek enthusiastic Software Engineers to design and build systems and tools, utilizing OCaml and Python for various tasks including data analysis and machine learning.

The analyst will conduct due diligence, perform valuation analysis, represent the firm in meetings, and communicate investment theses within a global capital markets team.

The HR Generalist will support employees by fielding HR queries, advising on policies, and assisting in benefit administration while collaborating on HR projects.

The Cybersecurity Engineer protects company assets through firm-wide defenses, incident response, and employee awareness initiatives, requiring strong technical skills and collaboration.

10-12 week internship working alongside salespeople and sales-traders to engage institutional clients, learn trading fundamentals across asset classes, complete real-world projects, attend classes and speaker events, and develop analytical, client-relations, and communication skills.

Support the Fundamental Research team on live projects across asset classes by evaluating trade ideas, performing due diligence, conducting valuation analysis for equity offerings, and documenting findings. Integrate traditional investment analysis with quantitative strategies and coordinate with internal stakeholders to gather information and feedback.

Interns pair with full-time mentors to maintain and improve a multi-vendor network supporting trading and internet traffic. Tasks include debugging routing protocols, provisioning feeds and third-party connections, site expansions and colocation work, automating support tasks, improving monitoring, performing root-cause analysis, and building production-ready solutions. Work involves command-line *nix use and programming to automate and instrument network operations.

Hands-on ML internship working on real production ML projects with mentor guidance. Build and optimize ML models and workflows using a large GPU cluster for noisy financial data; collaborate with engineers and attend ML-specific training and technical interviews.

The Cybersecurity Engineer will protect data and infrastructure, lead awareness efforts, analyze events, and respond to incidents while understanding the balance between security and usability.

The Cybersecurity Engineer is responsible for protecting data and infrastructure, implementing firm-wide defenses, leading awareness efforts, and handling incident responses.