Senior Ultra-Low Latency Java Developer – Onsite

CMC Markets; Greater London; On-site; GBP 110,000 - 140,000; Full time

Job summary

CMC Markets is seeking a Senior Low Latency Java Developer to join our Quantitative Strategies team within Pricing & Risk, working on our high-performance trading platform in London. This onsite role requires hands-on design and optimization of ultra-fast pricing and risk systems, with a focus on concurrency, JVM tuning and low-latency architecture.

You will mentor peers and contribute to live trading infrastructure in a fast-paced environment.

Qualifications

• Strong hands-on Java development experience within low latency financial systems.
• Deep understanding of performance optimisation, concurrency and JVM internals.
• Experience working on pricing, risk or electronic trading platforms.
• Knowledge of FIX protocol, order routing and broker connectivity highly beneficial.
• Strong mathematical and problem-solving mindset.
• Experience across asset classes such as FX, Equities, Commodities or Derivatives preferred.
• Ability to operate calmly in a fast-paced, front-office trading environment.
• Experience mentoring engineers and influencing technical direction.

Responsibilities

• Develop and optimise high-performance Java (21+) systems for pricing, risk and trading.
• Build and enhance components within a low latency, high-throughput trading architecture.
• Apply advanced concurrency, memory management and performance tuning techniques.
• Take responsibility for designing scalable, resilient and maintainable systems.
• Contribute to architectural decisions across the trading and risk platform.
• Build tooling to improve monitoring, maintenance and performance diagnostics.
• Work closely with Quants, Financial Engineering, Front Office and Business Operations.
• Support live trading systems, troubleshooting time-critical production issues.
• Contribute to the continuous evolution of our electronic trading infrastructure.
• Provide guidance and mentorship to junior developers.
• Champion engineering best practices, clean code principles and robust design patterns.

Skills

Java

Low latency

Concurrency

JVM tuning

Trading systems

Job description

CMC Markets is seeking a Senior Low Latency Java Developer to join our Quantitative Strategies team within Pricing & Risk, working on our high-performance trading platform in London. This onsite role requires hands-on design and optimization of ultra-fast pricing and risk systems, with a focus on concurrency, JVM tuning and low-latency architecture.

You will mentor peers and contribute to live trading infrastructure in a fast-paced environment.