We are looking for an engineer with experience in low-level systems programming and optimisation to join our growing ML team. 

Machine learning is a critical pillar of Jane Street's global business. Our ever-evolving trading environment serves as a unique, rapid-feedback platform for ML experimentation, allowing us to incorporate new ideas with relatively little friction.

Your part here is optimising the performance of our models – both training and inference. We care about efficient large-scale training, low-latency inference in real-time systems and high-throughput inference in research. Part of this is improving straightforward CUDA, but the interesting part needs a whole-systems approach, including storage systems, networking and host- and GPU-level considerations. Zooming in, we also want to ensure our platform makes sense even at the lowest level – is all that throughput actually goodput? Does loading that vector from the L2 cache really take that long?

If you’ve never thought about a career in finance, you’re in good company. Many of us were in the same position before working here. If you have a curious mind and a passion for solving interesting problems, we have a feeling you’ll fit right in. 

There’s no fixed set of skills, but here are some of the things we’re looking for:

• An understanding of modern ML techniques and toolsets
• The experience and systems knowledge required to debug a training run’s performance end to end
• Low-level GPU knowledge of PTX, SASS, warps, cooperative groups, Tensor Cores and the memory hierarchy
• Debugging and optimisation experience using tools like CUDA GDB, NSight Systems, NSight Computesight-systems and nsight-compute
• Library knowledge of Triton, CUTLASS, CUB, Thrust, cuDNN and cuBLAS
• Intuition about the latency and throughput characteristics of CUDA graph launch, tensor core arithmetic, warp-level synchronization and asynchronous memory loads
• Background in Infiniband, RoCE, GPUDirect, PXN, rail optimisation and NVLink, and how to use these networking technologies to link up GPU clusters
• An understanding of the collective algorithms supporting distributed GPU training in NCCL or MPI
• An inventive approach and the willingness to ask hard questions about whether we're taking the right approaches and using the right tools
• Fluent in English

If you're a recruiting agency and want to partner with us, please reach out to agency-partnerships@janestreet.com.

About the Company

The company is the world’s first licensed hybrid decentralized exchange (DEX), on a mission to make wealth-building as natural as daily life. It is building a compliant, self-custodial platform for premium tokenized strategies—from crypto to alternative investments—on trusted infrastructure.

Key Responsibilities:

• Architect and Develop: Build and maintain sophisticated, responsive web applications using React, Next.js, Sass, and TypeScript.

• Design Collaboration: Work closely with UX/UI designers to translate complex design specifications into high-quality code, ensuring visual consistency and an intuitive user interface.

• Performance Optimization: Audit and optimize applications to ensure maximum speed, responsiveness, and scalability across various devices and browsers.

• Code Excellence: Write clean, modular, and well-documented code while adhering to industry best practices and internal coding standards.

• Technical Troubleshooting: Identify, debug, and resolve complex frontend issues to maintain optimal platform performance and stability.

• Continuous Improvement: Stay at the forefront of frontend technologies and industry trends to continuously evolve our development processes and toolkit.

Required Qualifications:

• Education: Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.

• Professional Experience: 2 to 4+ years of proven experience in frontend development, specifically within high-traffic or complex application environments.

• Technical Mastery: Advanced proficiency in React and a deep understanding of core web technologies including HTML5, CSS3, and JavaScript/TypeScript.

• Responsive Design: Demonstrated expertise in implementing responsive web design and ensuring seamless cross-browser compatibility.

• Version Control: Strong experience using Git for version control and collaborative development workflows.

About the Company

The company is the world’s first licensed hybrid decentralized exchange (DEX), on a mission to make wealth-building as natural as daily life. It is building a compliant, self-custodial platform for premium tokenized strategies—from crypto to alternative investments—on trusted infrastructure.

Key Responsibilities:

• Architect and Develop: Build and maintain sophisticated, responsive web applications using React, Next.js, Sass, and TypeScript.

• Design Collaboration: Work closely with UX/UI designers to translate complex design specifications into high-quality code, ensuring visual consistency and an intuitive user interface.

• Performance Optimization: Audit and optimize applications to ensure maximum speed, responsiveness, and scalability across various devices and browsers.

• Code Excellence: Write clean, modular, and well-documented code while adhering to industry best practices and internal coding standards.

• Technical Troubleshooting: Identify, debug, and resolve complex frontend issues to maintain optimal platform performance and stability.

• Continuous Improvement: Stay at the forefront of frontend technologies and industry trends to continuously evolve our development processes and toolkit.

Required Qualifications:

• Education: Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.

• Professional Experience: 2 to 4+ years of proven experience in frontend development, specifically within high-traffic or complex application environments.

• Technical Mastery: Advanced proficiency in React and a deep understanding of core web technologies including HTML5, CSS3, and JavaScript/TypeScript.

• Responsive Design: Demonstrated expertise in implementing responsive web design and ensuring seamless cross-browser compatibility.

• Version Control: Strong experience using Git for version control and collaborative development workflows.

About the Company

The company is the world’s first licensed hybrid decentralized exchange (DEX), on a mission to make wealth-building as natural as daily life. It is building a compliant, self-custodial platform for premium tokenized strategies—from crypto to alternative investments—on trusted infrastructure.

Key Responsibilities:

• Architect and Develop: Build and maintain sophisticated, responsive web applications using React, Next.js, Sass, and TypeScript.

• Design Collaboration: Work closely with UX/UI designers to translate complex design specifications into high-quality code, ensuring visual consistency and an intuitive user interface.

• Performance Optimization: Audit and optimize applications to ensure maximum speed, responsiveness, and scalability across various devices and browsers.

• Code Excellence: Write clean, modular, and well-documented code while adhering to industry best practices and internal coding standards.

• Technical Troubleshooting: Identify, debug, and resolve complex frontend issues to maintain optimal platform performance and stability.

• Continuous Improvement: Stay at the forefront of frontend technologies and industry trends to continuously evolve our development processes and toolkit.

Required Qualifications:

• Education: Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.

• Professional Experience: 2 to 4+ years of proven experience in frontend development, specifically within high-traffic or complex application environments.

• Technical Mastery: Advanced proficiency in React and a deep understanding of core web technologies including HTML5, CSS3, and JavaScript/TypeScript.

• Responsive Design: Demonstrated expertise in implementing responsive web design and ensuring seamless cross-browser compatibility.

• Version Control: Strong experience using Git for version control and collaborative development workflows.

About the Company

The company is the world’s first licensed hybrid decentralized exchange (DEX), on a mission to make wealth-building as natural as daily life. It is building a compliant, self-custodial platform for premium tokenized strategies—from crypto to alternative investments—on trusted infrastructure.

Key Responsibilities:

• Architect and Develop: Build and maintain sophisticated, responsive web applications using React, Next.js, Sass, and TypeScript.

• Design Collaboration: Work closely with UX/UI designers to translate complex design specifications into high-quality code, ensuring visual consistency and an intuitive user interface.

• Performance Optimization: Audit and optimize applications to ensure maximum speed, responsiveness, and scalability across various devices and browsers.

• Code Excellence: Write clean, modular, and well-documented code while adhering to industry best practices and internal coding standards.

• Technical Troubleshooting: Identify, debug, and resolve complex frontend issues to maintain optimal platform performance and stability.

• Continuous Improvement: Stay at the forefront of frontend technologies and industry trends to continuously evolve our development processes and toolkit.

Required Qualifications:

• Education: Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.

• Professional Experience: 2 to 4+ years of proven experience in frontend development, specifically within high-traffic or complex application environments.

• Technical Mastery: Advanced proficiency in React and a deep understanding of core web technologies including HTML5, CSS3, and JavaScript/TypeScript.

• Responsive Design: Demonstrated expertise in implementing responsive web design and ensuring seamless cross-browser compatibility.

• Version Control: Strong experience using Git for version control and collaborative development workflows.

About the Company

The company is the world’s first licensed hybrid decentralized exchange (DEX), on a mission to make wealth-building as natural as daily life. It is building a compliant, self-custodial platform for premium tokenized strategies—from crypto to alternative investments—on trusted infrastructure.

Key Responsibilities:

• Architect and Develop: Build and maintain sophisticated, responsive web applications using React, Next.js, Sass, and TypeScript.

• Design Collaboration: Work closely with UX/UI designers to translate complex design specifications into high-quality code, ensuring visual consistency and an intuitive user interface.

• Performance Optimization: Audit and optimize applications to ensure maximum speed, responsiveness, and scalability across various devices and browsers.

• Code Excellence: Write clean, modular, and well-documented code while adhering to industry best practices and internal coding standards.

• Technical Troubleshooting: Identify, debug, and resolve complex frontend issues to maintain optimal platform performance and stability.

• Continuous Improvement: Stay at the forefront of frontend technologies and industry trends to continuously evolve our development processes and toolkit.

Required Qualifications:

• Education: Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.

• Professional Experience: 2 to 4+ years of proven experience in frontend development, specifically within high-traffic or complex application environments.

• Technical Mastery: Advanced proficiency in React and a deep understanding of core web technologies including HTML5, CSS3, and JavaScript/TypeScript.

• Responsive Design: Demonstrated expertise in implementing responsive web design and ensuring seamless cross-browser compatibility.

• Version Control: Strong experience using Git for version control and collaborative development workflows.

About the Company

The company is the world’s first licensed hybrid decentralized exchange (DEX), on a mission to make wealth-building as natural as daily life. It is building a compliant, self-custodial platform for premium tokenized strategies—from crypto to alternative investments—on trusted infrastructure.

Key Responsibilities:

• Architect and Develop: Build and maintain sophisticated, responsive web applications using React, Next.js, Sass, and TypeScript.

• Design Collaboration: Work closely with UX/UI designers to translate complex design specifications into high-quality code, ensuring visual consistency and an intuitive user interface.

• Performance Optimization: Audit and optimize applications to ensure maximum speed, responsiveness, and scalability across various devices and browsers.

• Code Excellence: Write clean, modular, and well-documented code while adhering to industry best practices and internal coding standards.

• Technical Troubleshooting: Identify, debug, and resolve complex frontend issues to maintain optimal platform performance and stability.

• Continuous Improvement: Stay at the forefront of frontend technologies and industry trends to continuously evolve our development processes and toolkit.

Required Qualifications:

• Education: Bachelor’s degree in Computer Science, Software Engineering, or a related technical field.

• Professional Experience: 2 to 4+ years of proven experience in frontend development, specifically within high-traffic or complex application environments.

• Technical Mastery: Advanced proficiency in React and a deep understanding of core web technologies including HTML5, CSS3, and JavaScript/TypeScript.

• Responsive Design: Demonstrated expertise in implementing responsive web design and ensuring seamless cross-browser compatibility.

• Version Control: Strong experience using Git for version control and collaborative development workflows.