Real-Time C# / .NET Engineer — Low-Latency Trading

Margoconsulting; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

MARGO is seeking an experienced C# / .NET Developer to join our Front Office / Trading IT environments in London. The role focuses on real-time, low-latency systems, performance, scalability and robustness, with collaboration across trading, quantitative and risk teams.

Ideal candidates will have prior exposure to Front Office, Trading or Risk environments and a strong production mindset, delivering high-quality, maintainable code within demanding constraints.

Qualifications

• Strong experience as a C# / .NET Developer in performance-sensitive environments.
• Proven background in real-time or high-throughput systems.
• Solid understanding of concurrency, parallelism and memory optimisation.
• Experience working in Front Office, Trading or Risk IT environments.
• Strong production mindset and system ownership.
• Clear communication and structured problem-solving skills.

Responsibilities

• Design, develop and maintain high-performance C# / .NET applications.
• Work on real-time data processing including market data, pricing, orders, analytics and risk calculations.
• Implement concurrency and parallel programming patterns adapted to performance-sensitive systems.
• Participate in system design, architecture discussions and technical specifications.
• Continuously optimise performance including latency, throughput and memory usage.
• Produce clean, maintainable and well-tested code.
• Contribute to the full software lifecycle: design, development, testing and release.
• Provide 3rd line support on production systems when required.

Skills

C# / .NET

Concurrency

Memory optimisation

Real-time systems

Front Office exposure

Tools

Kafka

Solace

FIX

Job description

MARGO is seeking an experienced C# / .NET Developer to join our Front Office / Trading IT environments in London. The role focuses on real-time, low-latency systems, performance, scalability and robustness, with collaboration across trading, quantitative and risk teams.

Ideal candidates will have prior exposure to Front Office, Trading or Risk environments and a strong production mindset, delivering high-quality, maintainable code within demanding constraints.