Low-Latency Engineer

Jane Street

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New York, New York, US Until 8/21/2026 H-1B sponsor history First posted March 26, 2025 Last posted March 26, 2025
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

 

If you're a recruiting agency and want to partner with us, please reach out to [email protected].

About this role

Summary

Design and optimize high-performance, low latency trading systems, focusing on systems programming and hardware performance.

Job title

Low-Latency Engineer

Experience level

mid level

Industry

finance

Location requirements

On-site in New York, NY, no remote work allowed.

Salary

Not specified

Visa sponsorship

H-1B sponsor history

Management role

No

Skills & keywords

Required skills

systems programmingperformance optimizationnetwork applicationshardware performance countersprofiling tools

Preferred skills

kernel-bypassfast-packet processinglanguage performance challengesfunctional programming

Specializations

low latencysystems programmingperformance optimizationnetwork applicationshardware profiling
Locations

Structured locations inferred from the posting.

New York, NY, USA

On-site City