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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C++ Engineer in London employer: Ncounter Limited
Ncounter is an exceptional employer for those seeking to make a significant impact in the public sector through digital transformation. With a hybrid work model that promotes flexibility and occasional client travel, employees benefit from a collaborative culture that values diverse experiences and encourages professional growth. The company offers clear pathways for advancement, ensuring that consultants can take ownership of their engagements while contributing to meaningful change in complex environments.
