C++ Software Engineer

C++ Software Engineer

London | Hybrid (2-3 days per week) | Competitive salary + bonus

Ncounter is partnering with a leading trading technology group to hire an exceptional C++ Software Engineer to build and evolve high-performance order gateway systems used in fast-moving fixed income markets. This is a hands-on role developing ultra-low-latency services that handle order validation, routing and exchange connectivity - the backbone of real-time trading.

You’ll join a collaborative team of developers, quants and platform engineers, working across a high-availability C++ codebase to deliver fast, resilient and observable services. You’ll be empowered to design, implement and test software that directly impacts trading performance, scalability and reliability.

Key Responsibilities:

• Design and develop high-throughput order gateway components in modern C++

• Implement robust connectivity, order validation and routing logic for fixed income markets

• Profile and optimise multi-threaded code paths, eliminating performance bottlenecks

• Apply concurrency, lock-free and memory-efficient techniques to maximise throughput

• Collaborate with quantitative researchers, traders and SRE teams to deliver reliable releases

• Contribute to automated testing, verification and CI/CD pipelines

• Provide 2nd/3rd line application support, analysing production telemetry and driving improvements

Core Skills & Experience:

• Strong proficiency in modern C++ (C++17 or later) and STL

• Deep understanding of multi-threading, low-latency optimisation and Linux systems

• Experience working on high-frequency or real-time systems (financial or otherwise)

• Familiarity with network programming, serialization and distributed architectures

• Strong analytical and debugging skills, using profiling tools to measure performance

• Exposure to Python, Bash, or similar for automation and testing is advantageous

• Knowledge of fixed income products (corporate bonds, treasuries, IRS, CDS) is helpful

This is an opportunity to work at the heart of a global trading platform, building technology that traders and researchers rely on every day. If you’re a passionate C++ engineer who thrives on writing elegant, high-performance code, we’d love to hear from you.

Apply now through Ncounter for a confidential discussion and to learn more about this role.