C# Developer (Fintech)

TL;DR

C# Developer (Fintech): Building and enhancing a distributed, real-time P&L and risk analytics platform used by Fixed Income Rates and FX trading desks with an accent on scalable .NET/C# services and real-time data processing systems. Focus on distributed streaming architecture, system integrations, data materialisation layers, and optimisation for critical trading decisions.

Location: London (Hybrid, 3 days per week on-site)

Company

Global company building cutting-edge financial systems within a global markets environment.

What you will do

• Develop and maintain scalable .NET/C# services within a distributed streaming architecture
• Build and support real-time data processing systems for P&L and risk analytics
• Work on out-of-process services, system integrations, and data materialisation layers
• Drive Agile best practices, including test-driven development (TDD) and automation
• Collaborate with developers, traders, and quantitative teams across EMEA, NY, and APAC
• Take ownership of features, propose improvements, troubleshoot issues, and unblock cross-team dependencies

Requirements

• Strong expertise in C# / .NET development
• Experience with Redis Cluster
• Solid understanding of TDD and automated testing
• Experience with CI/CD pipelines
• Strong communication and stakeholder engagement skills
• Strong grounding in computer science fundamentals and design patterns
• Collaborative team player with a proactive mindset

Nice to have

• Experience with distributed systems, streaming, and messaging (e.g. Rx .NET)
• Knowledge of performance and memory profiling
• Experience optimising systems for speed and efficiency
• Familiarity with modern CI/CD tools and practices
• End-to-end experience across the full software development lifecycle