Jobs at Jane Street

• Think about infrastructure design and resiliency associated with trading environments
• Understand the communication protocol topology necessary for critical infrastructure monitoring and trending

• Available to work 40 hours per week in person in our New York office (approx. hours are 8:30 a.m. to 5:30 p.m. Monday - Friday)
• Knowledgeable of computer hardware components and how they interact with each other

• Have significant professional experience building and shipping macOS applications, and strong expertise in the Apple ecosystem
• Have a strong working knowledge of Swift, and are comfortable reading and modifying Objective-C where it comes up

• Comfortable with a software programming language
• Experienced with a Hardware Description (or Construction) language (VHDL, Verilog, Chisel, Pymtl, or other), for both writing and testing hardware designs

• Curious about what data means, not just how to move it from one place to another
• Comfortable manipulating data in Python, SQL, R, or similar. You don't need to be a polished software engineer, but you should be able to turn an idea into working code

• Assisting with all system queries and issue resolution
• Helping maintain system workflows and business process approval chains

• Developing and maintaining tools and applications related to Windows automation and configuration management
• Improving our CI/CD systems, cross-platform frameworks, and software development environments

• Knowledgeable about operating system fundamentals and computer architecture
• Experienced with systems programming concepts like sockets, virtual memory, and the process life cycle

• An undergraduate or PhD student with practical experience training an ML model, working on an ML library, or optimizing an ML workflow
• A top-notch programmer with a love for technology

• A top-notch programmer with a love for technology
• Intellectually curious, collaborative, and eager to learn

• Working on cross-team projects such as site expansions and new colocation builds
• Debugging routing protocols

• Supporting and improving the vulnerability management lifecycle end to end, from discovery and validation through triage, assignment, remediation tracking, and verification
• Reviewing new findings from automated scanning tools, threat intel, and security advisories, then prioritizing based on real exploitability and exposure rather than severity score alone, so we act on what genuinely matters

About the Position
We are looking for an experienced software engineer to work on code generation in the OxCaml compiler, which is open source. OxCaml is Jane Street’s variant of the OCaml language, equipped with powerful features for high-performance and parallel programming, with data race free...

• Have strong scripting or programming, and surrounding practices: You have an interest and ability to automate in a real programming language, ability and desire to manage your code and configs in version control, and knowledge of your editor (we don't care which editor, though)
• A measured responder: Not everyone should be locking their entire lives down in the name of sec...

• Investigating data quality and reliability issues
• Interfacing with exchanges or data vendors, raising, tracking, and resolving issues

• Offensive security background
• Can help build and implement secure solutions from the ground up

• Proactively proposing, designing, testing, implementing, and documenting strategic security controls
• Coordinating and delivering security solutions across our IT platforms while identifying opportunities to further automate intelligent workflows

• Able to apply logical and mathematical thinking to all kinds of problems
• Intellectually curious; eager to ask questions, admit mistakes, and learn new things

• A top-notch programmer with a love for technology
• Comfortable with a software programming language

• Practical experience working on empirical ML problems
• The ability to apply logical and mathematical thinking to all kinds of problems