Senior .Net Developer - Electronic Trading OR Fixed Income

Senior .NET Developer | Electronic Trading

• Hybrid (London)
• £600 to £800 per day (Inside IR35)
• Initial 12-Month Contract We're partnering with a leading global financial services organisation on a major greenfield transformation programme to modernise and enhance electronic trading capabilities within Fixed Income markets. This is a fantastic opportunity for an experienced Senior .NET Developer to join a highly visible, long-term initiative focused on building a next-generation cloud-based electronic trading platform. You'll work closely with trading desks, business stakeholders, and technology teams across multiple locations to deliver innovative, high-performance solutions that directly support global trading operations. The Opportunity As a Senior Developer, you'll play a key role in designing and delivering a modern electronic trading platform built on cloud-native technologies. Working within a small, agile team, you'll help shape the architecture, development standards, and technical direction of a business-critical platform. Key Responsibilities
• Lead the delivery of high-quality software solutions across the full development life cycle
• Contribute to technical design and architecture decisions
• Ensure best practices around code quality, automated testing, CI/CD, and software engineering standards
• Collaborate closely with traders, business stakeholders, and technology teams
• Design and develop scalable APIs and microservices
• Support the evolution of a cloud-based trading platform Essential Skills & Experience
• Strong commercial experience with .NET/.NET Core
• Excellent understanding of Object-Oriented Design and SOLID principles
• Experience developing ASP.NET Core Web APIs and RESTful services
• Strong knowledge of multi-threading and asynchronous programming
• Experience with SQL and NoSQL databases
• Hands-on experience with Docker and containerisation
• Proven experience building microservices and service-oriented architectures
• Strong automated testing experience using tools such as NUnit, Moq, Cucumber
• Experience with messaging technologies including RabbitMQ, TIBCO, SignalR or similar
• Strong understanding of CI/CD pipelines, Git, TeamCity or equivalent
• Experience working within Agile development environments Desirable Experience
• Fixed Income or Electronic Trading experience
• Exposure to financial markets and trading systems
• AWS Cloud experience
• Understanding of modern JavaScript frameworks
• CI/CD pipeline configuration and optimisation What We're Looking For
• Strong problem-solving and analytical skills
• Excellent communication and stakeholder management abilities
• Self-motivated and delivery-focused mindset
• Comfortable working in fast-paced, agile environments
• Passion for building scalable, high-performance technology solutions Apply Now