C#/.NET Software Engineer – Financial Markets | 12 Month Daily Rate Contract

We’re looking for a Senior C#/.NET Software Engineer to join a high-performing technology team supporting a global financial markets business.

This is an opportunity to work on complex, business-critical systems where engineering quality, performance and reliability genuinely matter. You’ll be involved across the full software development lifecycle, from architecture and design through to development, testing, deployment and production support.

You’ll work alongside experienced Engineers, Traders and business Stakeholders to solve challenging problems and build resilient, scalable services for this completely in-house built Trade Capture platform for the FX Options and Credit Default Swaps (CDS) markets.  

What you’ll be doing

• Design and develop high-performance applications using C# and .NET
• Build and evolve distributed, microservices-based systems
• Take ownership across the full SDLC — architecture, design, development, testing and deployment
• Modernise existing services and contribute to technology migration initiatives
• Develop scalable RESTful APIs and service-to-service integrations
• Work with messaging and streaming technologies such as Kafka, RabbitMQ or AWS SNS/SQS
• Improve application performance, reliability and code quality
• Work with relational and/or NoSQL databases
• Contribute to engineering practices including TDD, code reviews, pair programming and CI/CD
• Work with cloud and containerised environments including AWS, Docker and Kubernetes
• Provide production support and troubleshoot complex technical issues when required

• 6+ years of commercial C#/.NET development experience
• Strong experience with modern .NET / .NET Core
• Excellent understanding of object-oriented design, data structures, algorithms and software engineering principles
• Strong experience designing and developing microservices
• Experience building and consuming REST APIs
• Solid understanding of concurrency, scalability and performance optimisation
• Experience with SQL and/or NoSQL databases
• Strong understanding of modern engineering practices including TDD, CI/CD, code reviews and Git
• Experience working with AWS and/or cloud-native technologies
• Experience with Docker and Kubernetes
• Exposure to Kafka, RabbitMQ, SNS/SQS or similar messaging platforms
• Experience with Angular or React would be advantageous
• Comfortable working in Linux environments and with scripting
• A strong focus on clean code, maintainability and engineering quality
• Previous Front Office/Trading systems Development experience (ideally Trade Capture or related FICC systems) highly adventageous