Low-Latency Fullstack Engineer (Java/C++) – London Onsite

Vallum Associates; Barking; On-site; GBP 120,000 - 180,000; Full time

Job summary

Vallum Associates in London seeks a seasoned Full Stack Engineer to join onsite three days a week. You will help build real-time market data distribution platforms embedded in high-frequency trading environments, collaborating with quantitative, trading, and engineering teams to push speed and reliability.

The role focuses on designing low-latency software, optimizing Linux-based systems, and delivering fault-tolerant, sub-microsecond solutions across 70+ feeds; you will mentor,

Qualifications

• 5–10 years of software engineering experience in HFT or ultra-low-latency environments.
• Strong Core Java and C++ expertise.
• Deep Linux kernel bypass low-latency tuning and network programming.
• Experience with market data protocols and massive feed dissemination.

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 (including UBS Bluezone and UBSDeploy)
• Integrate, optimize, 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

Low-latency networking

Market data distribution

Education

Tools

Refinitiv ETA

Denali

MPAC

Beacon

UBS Bluezone

UBSDeploy

Job description

Vallum Associates in London seeks a seasoned Full Stack Engineer to join onsite three days a week. You will help build real-time market data distribution platforms embedded in high-frequency trading environments, collaborating with quantitative, trading, and engineering teams to push speed and reliability.

The role focuses on designing low-latency software, optimizing Linux-based systems, and delivering fault-tolerant, sub-microsecond solutions across 70+ feeds; you will mentor,