Senior Java Engineer - Low Latency - Contract - London Hybrid - £600pd via umbrella

3 days per week on site

£600 per day via umbrella

12 month contract

Responsibilities

Design, develop and maintain high-performance, ultra-low-latency trading applications and market data distribution systems
Build and support pricing tick infrastructure, pricing streams and pricing execution components
Deliver low-latency network programming and Kernel bypass solutions on Linux
Integrate, optimise and distribute Real Time market data across 70+ proprietary direct feeds (EMEA, US Options, MiFID II market structures)
Profile and troubleshoot latency, and tune applications, JVMs, CPUs and network stacks
Work with market data protocols including Refinitiv ETA, Denali, MPAC and Beacon
Manage deployments and tooling through # pipelines
Support knowledge transfer and handover from the outgoing vendor team

Essential

5 to 10 years of software engineering in HFT, electronic trading, or ultra-low or low-latency environments
Strong core Java, with proven low-latency engineering (the primary skill, per Evgen)
Low-level memory management, including off-heap and Java Unsafe
JNI (Java Native Interface)
GC tuning and CPU tuning (for example affinity and pinning)
Experience on trading platforms: pricing ticks, pricing streams, order and execution flow
Deep Linux knowledge, including Kernel bypass and low-latency network programming
Strong profiling, performance tuning and troubleshooting
A track record at global banks, hedge funds or HFT firms (this also decides whether the CV skips the TI)

Desirable

C++, ideally in a mixed Java and C++ environment. Evgen called this "rather nice to have" but "highly beneficial", even though the JD lists it as essential
Market data protocols: Refinitiv ETA, Denali, MPAC, Beacon
EMEA, US Options and MiFID II market structure, direct exchange feeds
Event-driven and distributed systems, hardware and software co-design
Hardware timestamping, network telemetry and advanced monitoring
CI/CD, automated testing and DevOps for low-latency builds
An ownership-driven approach on busy trading floors

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