C# /.NET Developer – Front Office, Electronic & Low Latency Trading Systems

About the Position

C# / .NET Developer – Front Office, Electronic & Low Latency Trading Systems

Join MARGO in the UK (London) – Perm & Contracting Opportunities

MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry.

We specialise in complex software engineering environments where performance, robustness and scalability are critical: real-time systems, low-latency architectures, distributed computing and high-throughput data processing.

Joining MARGO means working in demanding Front Office and Trading IT environments, while benefiting from a human-sized structure, close follow-up and tailor-made training paths.

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Responsibilities

Design & Development

• 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

Engineering & Delivery

• Contribute to the full software lifecycle: design, development, testing and release
• Produce clean, maintainable and well-tested code
• Participate in sprint planning, estimations and technical reviews
• Collaborate closely with developers, quant and infrastructure teams

Production & Support

• Provide 3rd line support on production systems when required
• Participate in production releases including occasional out-of-hours interventions
• Contribute to system stability, monitoring and incident prevention

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Requirements

Essential

• 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

Valued (but not restrictive)

• Exposure to electronic trading platforms or low-latency environments
• Experience across one or more asset classes (Equities, Fixed Income, Commodities, FX, Derivatives)
• Familiarity with distributed, grid or event-driven systems
• Interaction with C++ low-latency or HFT-adjacent components

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Technical Environment

Core Technologies

• C# /.NET (expert level)
  • Concurrency and parallel programming
  • Asynchronous and multithreaded models
  • Memory management and performance profiling
• Distributed and event-driven architectures
• Windows and/or Linux production environments
• Performance monitoring and profiling tools

Valued Technical Exposure

• Electronic trading or low-latency trading systems
• High-throughput or real-time architectures
• Messaging middleware (Kafka, Solace or equivalent)
• FIX or other market connectivity protocols
• RESTful or service-oriented architectures
• High Performance Computing (HPC) or grid computing concepts

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We Offer

• Access to multi-asset Front Office, Trading and Electronic Trading environments
• Highly technical and challenging engineering assignments
• Clear positioning between HFT and non-HFT trading systems
• Strong emphasis on skill development and long-term career progression
• Human-sized consultancy with close support and high-quality missions

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About the Company

MARGO is a tech-native consultancy delivering high value-added IT expertise to the financial services industry. We specialise in complex software engineering environments where performance, robustness and scalability are critical.

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Please note - We do not offer visa sponsorship for this position.

Interested? Motivated? Apply on our website or at [email protected]

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.