MARGO
C# / .NET Developer – Front Office, Electronic & Low Latency Trading Systems
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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.
Business Context
You will join the Front Office / Trading IT environment of one of our tier-1 investment banking or trading partners. The teams design and maintain mission-critical C# /.NET systems supporting electronic trading, real-time risk, and analytics platforms across multiple asset classes (Equities, Fixed Income, Rates risk and P&L, Commodities, FX, Derivatives). These systems operate close to trading desks and electronic trading platforms, with strong constraints on performance, reliability, and production stability. The environment is characterised by:
- Real-time and event-driven architectures
- Low-latency and high-throughput processing requirements
- Strong production and stability constraints
- Close interaction with trading, quantitative, and risk teams
- High engineering standards and short delivery cycles
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Key Responsibilities
- Design & Development: Write high-performance, clean, and maintainable C# /.NET applications. Implement advanced concurrency, parallel programming, and asynchronous patterns for performance-sensitive trading systems.
- Project Ownership: Act as a technical driver—taking end-to-end ownership of features, collaborating with traders, quants, and regional teams to unblock issues and propose constructive architecture solutions.
- Optimization: Continuously profile and optimize systems for speed, memory usage, and throughput (including memory/performance profiling and garbage collection tuning).
- Engineering Excellence: Drive Agile development, Test-Driven Development (TDD), and robust CI/CD automation pipelines.
- Production Support: Maintain system stability, provide 3rd line support when required, and participate in production releases.
Technical Environment
Core Tech Stack:
- Language/Framework: C# /.NET (Expert level) with deep knowledge of its ecosystem, multithreading, and asynchronous models.
- Architecture: Distributed, event-driven, and Service-Oriented Architectures (SOA).
- Data & Caching: MS SQL, ORM libraries (Dapper), and Redis Cluster.
- Messaging & Streaming: Rebus, Rx.NET, Kafka, Solace, or equivalent middleware.
- DevOps & Tools: Git (Bitbucket), TeamCity, CI/CD pipelines, and Windows/Linux environments.
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Valued Financial/Domain Exposure:
- FIX protocol or market connectivity.
- Asset class knowledge: Fixed Income (Rates), FX, Equities, Commodities, or Derivatives.
- Functional experience with Cash Forecasting or Risk/P&L analytics.
Required Experience & Skills
- Senior-Level Engineering: Strong background as a C# /.NET Developer in high-throughput, real-time, or low-latency environments.
- Computer Science Fundamentals: Deep understanding of Object-Oriented Programming (OOP), SOLID principles, design patterns, and memory optimization.
- Front Office Mindset: Highly motivated to work directly with front-office IT teams, displaying a strong production mindset, integrity, and discipline under time constraints.
- Proactive Communicator: A team player with excellent communication and analytical skills, able to challenge status-quo and collaborate across global time zones.
- Quality First: A passion for clean code, refactoring, TDD, and automated testing.
Why Join MARGO
- 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
Please note - We do not offer visa sponsorship for this position.
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