Low-Latency Engineer

Jane Street

$120K — $180K *
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5+ years of experience in low-level systems programming and optimization.
  • Expertise in developing network applications for low latency and high throughput.
  • Ability to analyze and enhance application performance using hardware performance counters.
  • In-depth knowledge of modern computer architecture, particularly x86 cache hierarchies.
  • Experience with fast-packet processing and kernel-bypass techniques is preferred.

Responsibilities

  • Collaborate with quantitative researchers and developers to design optimized trading systems.
  • Implement low-latency, high-performance solutions primarily in OCaml.
  • Analyze system performance and apply improvements based on profiling data.
  • Explore and leverage hardware features to maximize system efficiency.
  • Troubleshoot and resolve performance issues within network applications.

Benefits

  • Flexible working hours to foster work-life balance.
  • Opportunity for professional development and training in OCaml.
  • Collaborative environment with access to cutting-edge technologies.
  • Potential for participation in innovative financial projects.
Full Job Description
About the Position

We are looking for a Software Engineer with experience in high-performance, low latency systems. You'll work closely with our quantitative researchers and developers, taking a holistic approach to design and optimize our fast-trading systems.

We build systems primarily in OCaml with only small amounts of C and C++, but you don't need any experience with OCaml in particular (we can teach it to you) or knowledge of the financial markets. The most important qualification is experience with low level systems programming and optimization, whether it is in C, C++, or any other language.
About You
  • Experience with low level systems programming and optimization, and working on network applications that require extremely low latency and high throughput
  • Can understand, interpret, and improve application performance through hardware performance counters and other profiling tools
  • Has a thorough understanding of modern computer architecture and can talk to others about it; for example, can you describe modern x86 AMD and Intel cache hierarchies?
  • Some experience with fast-packet processing in user space and common kernel-bypass implementations would be ideal (such as Solarflare OpenOnload/TCPDirect/ef_vi, Exablaze, InfiniBand verbs, DPDK)
  • Experience working around the performance challenges of languages with a managed runtime (such as Java or C#) and familiarity with a typed functional language are a plus


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