Fullstack Engineer (Java /C++)

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

This Full Stack Engineer role in London is onsite three days per week, embedded in the heart of high-frequency trading environments. You shape the backbone of real-time market data distribution, collaborating with quantitative, trading, and engineering teams to push the limits of speed and reliability. The market rewards those who build platforms that never miss a tick.

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

Requirements

• 5-10 years of software engineering experience in high-frequency trading (HFT), financial markets, or ultra-low-latency environments
• Strong hands‑on development expertise with Core Java and C++
• Deep expertise in Linux systems, kernel bypass low‑latency tuning, and low‑latency network programming
• Expert knowledge of market data distribution protocols, including Refinitiv ETA, Denali, MPAC, and Beacon
• Comprehensive domain knowledge across EMEA, US Options, and MIFID II market structures, alongside experience with over 70 proprietary direct feeds
• Experience with deployment and management tools such as client Bluezone and client Deploy
• Strong performance tuning, profiling, and network/application troubleshooting skills
• Excellent problem‑solving, analytical, and communication abilities

Nice to Have

• Entrepreneurial mindset with a proactive, ownership‑driven approach in high‑pressure trading floors
• Experience in event‑driven architecture, distributed systems, and hardware-software co‑design
• Knowledge of CI/CD practices, automated testing, and DevOps automation tailored for low‑latency builds
• Experience working in large‑scale enterprise financial environments and electronic trading desks
• Familiarity with advanced monitoring, hardware timestamping, and network telemetry tools