Software Developer, C++ / Electronic Trading
London Hybrid Permanent
Ncounter is supporting the growth of a specialist electronic trading technology team responsible for building and enhancing high-performance systems operating across global financial markets. We are looking for an experienced Software Developer with strong C++ skills and a background working on low-latency trading technology.
You’ll work on business-critical applications including matching engines, FIX gateways and real-time trading systems, where performance, availability and efficient processing are fundamental. This is a hands‑on development role with considerable exposure to C++, alongside Java, Python and JavaScript within a predominantly Linux environment.
What you’ll be working on
- Designing and developing high-performance matching engines, FIX gateways and electronic trading applications
- Building low-latency, multithreaded systems using C++ and Java
- Processing real-time market and trading data through highly available systems
- Developing efficient in-memory data structures, lock‑free queues and circular buffers
- Working with TCP/IP, UDP, multicast and other networking technologies
- Troubleshooting, profiling and optimising performance-critical production applications
- Supporting automated testing, DevOps practices and CI/CD pipelines
- Working closely with trading, product and infrastructure teams throughout the development lifecycle
What we’re looking for
- 5+ years of professional software development experience
- Strong C++ development skills, ideally alongside commercial Java experience
- Hands‑on FIX protocol experience within electronic trading
- Experience building low-latency, high-frequency or performance‑critical systems
- Strong Linux knowledge covering multithreading, sockets, IPC and system‑level behaviour
- Good understanding of concurrency, memory management and in-memory optimisation
- Knowledge of NUMA architectures and performance‑focused programming techniques
- Experience with networking protocols including TCP/IP, UDP, unicast and multicast
- Python, SQL and relational database experience would be useful
This is an opportunity to work close to the core of electronic trading, solving challenging engineering problems where software performance has a direct business impact.
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