Onsite Ultra-Low-Latency Java/C++ Full-Stack Engineer

Vallum Associates; Greater London; On-site; GBP 120,000 - 190,000; Full time

Job summary

Vallum Associates in London seeks an experienced Java Low Latency - Full Stack Engineer to design and optimize ultra-fast, fault-tolerant systems for real-time market data distribution. You will work onsite three days per week, collaborating with quantitative, trading, and engineering teams to push sub-microsecond performance.

You will combine Core Java and C++ expertise with deep Linux knowledge to fine-tune network stacks, implement kernel bypass techniques, and deploy scalable platforms

Qualifications

• 5-10 years of software engineering experience in high-frequency trading (HFT), financial markets, or ultra-low-latency environments.
• Strong hands-on development with Core Java and C++.

Responsibilities

• Design, develop, and maintain high-performance, ultra-low-latency software applications and market data distribution systems.
• Build, tune, and support low-latency network programming solutions and kernel bypass architectures on Linux environments.
• Develop and enhance high-throughput, low-latency components using Core Java and C++.
• Manage deployments, tooling, and infrastructure automation using internal and enterprise deployment pipelines.
• Integrate, optimise, and distribute real-time market data across over 70 proprietary direct feeds in EMEA, US Options, and MIFID II market structures.
• Collaborate with cross-functional quantitative, trading, and engineering teams to deliver extremely reliable, fault-tolerant, and sub-microsecond resilient systems.
• Perform rigorous performance analysis, latency troubleshooting, and system tuning of applications, network stacks, and market data distribution protocols (Denali, MPAC, Beacon, Refinitiv ETA).
• Support knowledge transfer and handover activities as part of project onboarding and cross-team enablement

Skills

Core Java

C++

Linux

Kernel bypass tuning

Network programming

Latency tuning

Troubleshooting

Communication

Job description

Vallum Associates in London seeks an experienced Java Low Latency - Full Stack Engineer to design and optimize ultra-fast, fault-tolerant systems for real-time market data distribution. You will work onsite three days per week, collaborating with quantitative, trading, and engineering teams to push sub-microsecond performance.

You will combine Core Java and C++ expertise with deep Linux knowledge to fine-tune network stacks, implement kernel bypass techniques, and deploy scalable platforms