Low-Latency Engineer

Jane Street

New York, New York, United StatesPosted 6 days agoDirect from company

LocationNew York, New York, United States
Work typeOn-site
Posted3 November 2026
SourceJane Street's careers page (Greenhouse)

Live checkFirst seen 2 days ago; still listed on Jane Street's careers page 3 h ago.

At a glance

Skills and toolsC++, Java, C#

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United States
New York
Engineering
Software Engineering
c
c++
computer architecture
dpdk
hardware performance counters
kernel bypass
low-latency systems
network programming

About the role

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 agency-partnerships@janestreet.com .

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