Senior Java Developer (low latency)

Luxoft; Greater London; On-site; GBP 110,000 - 180,000; Full time

Job summary

Luxoft is seeking a senior software engineer to design and maintain low-latency market-data platforms in a Linux environment. You will optimize JVM performance, implement kernel-bypass networking, and integrate proprietary feeds for real-time data across EMEA and US markets.

The role requires strong Java expertise, C++ experience, and a track record in production-grade systems. Collaboration with global teams and a focus on throughput, latency, and reliability are essential.

Qualifications

• 8+ years of hands-on software development in performance-critical systems.
• Expertise in Core Java and JVM profiling/tuning (GC, memory, threads, latency).
• Strong Linux production debugging and troubleshooting experience.
• Experience building low-latency, high-throughput applications.
• Proficient in low-latency network programming (TCP/IP, sockets, data processing).
• C++ experience in performance-sensitive environments.

Responsibilities

• Design, develop, and maintain high-performance, low-latency applications using Core Java.
• Perform JVM profiling and tuning, including GC, memory, thread, CPU, and latency analysis.
• Develop and optimize low-latency network components and kernel-bypass solutions.
• Integrate and support direct feeds and market-data distribution protocols across EMEA and US Options markets.
• Identify performance bottlenecks and improve throughput, latency, and resource utilization.
• Investigate production incidents, perform root-cause analysis, and implement permanent fixes.
• Support deployment and production processes within Linux environments.
• Collaborate with global teams to deliver reliable market-data solutions.

Skills

Core Java

JVM Profiling

Linux Production

Low-latency Networking

C++ Performance

Real-time Market Data

Market Protocols

Exchange Connectivity

Job description

Project description

Join a global technology team responsible for developing and supporting high-performance market-data and trading platforms across EMEA and the US. The project focuses on low-latency distribution of real-time market data from more than 70 proprietary direct feeds, including US Options markets.The platform operates in a performance-critical Linux environment and requires efficient network programming, kernel-bypass technologies, and continuous JVM and application tuning. The team supports complex market-data workflows involving Denali, MPAC, Beacon, Refinitiv ETA, etc., while ensuring alignment with relevant market structures and regulatory requirements, including MiFID II.

Responsibilities

• Design, develop, and maintain high-performance, low-latency applications using Core Java.
• Perform JVM profiling and tuning, including garbage collection, memory, thread, CPU, and latency analysis.
• Develop and optimize low-latency network components and kernel-bypass solutions.
• Integrate and support proprietary direct feeds and market-data distribution protocols across EMEA and US Options markets.
• Identify performance bottlenecks and improve application throughput, latency, and resource utilization.
• Investigate production incidents, conduct root-cause analysis, and implement permanent fixes.
• Support deployment and production processes within Linux environments.
• Collaborate with global development, infrastructure, support, and business teams to deliver reliable market-data solutions.

SKILLS

Must have

• 8+ years of hands-on software development experience, with strong expertise in Core Java and performance-critical systems.
• Proven experience with JVM profiling and performance tuning, including garbage collection, memory, thread, CPU, and latency optimization.
• Strong Linux development and troubleshooting experience in production environments.
• Experience designing and developing low-latency, high-throughput, mission-critical applications.
• Strong knowledge of low-latency network programming, including TCP/IP, sockets, efficient data processing, and kernel-bypass technologies.
• Working knowledge of C++, particularly in performance-sensitive environments.
• Experience with real-time market-data or electronic-trading platforms, including direct feeds, distribution protocols, and exchange connectivity.
• Strong performance analysis, troubleshooting, and production-support capabilities, with the ability to identify bottlenecks and perform root-cause analysis.

Nice to have

• Knowledge of MiFID II market structure and experience with EMEA or US Options market-data feeds.
• Familiarity with Refinitiv ETA or similar real-time market-data distribution protocols.
• Advanced knowledge of hardware‑aware performance optimization, including CPU caches, NUMA, memory hierarchy, and NIC tuning.
• Experience with packet capture, network diagnostics, benchmarking, and observability tools.
• Advanced C++ performance optimization experience in low‑latency or high‑throughput environments.