Senior .NET Developer | £650/day Inside IR35 | C# | .NET 8+ | Azure | Event-Driven | Greenfield Modernisation

Senior .NET Developer | £650/day Inside IR35 | C# | .NET 8+ | Azure | Event-Driven | Greenfield Modernisation

A leading energy trading firm, currently undergoing a significant technology platform rebuild following exceptional business growth, is looking for multiple Senior .NET Developers to join their engineering team.

This is an opportunity to work on the modernisation of several business-critical trading applications, including Settlements, Trade Capture and Trade Operations , as the business moves away from legacy technology towards a modern .NET 8+ architecture .

As a Senior C# .NET Developer , you\'ll play a key role in designing and building scalable backend services and distributed applications that underpin the next generation of energy trading operations.

You\'ll work on greenfield development projects , contributing to technical design and architectural decisions while helping build highly scalable, resilient and maintainable systems using modern engineering practices.

Working alongside experienced engineers, architects and business stakeholders, you\'ll be involved throughout the full software development lifecycle — from technical design and development through to testing, deployment and continuous improvement.

The successful Senior .NET Developer will have strong experience with C#, .NET Core/.NET 8+, Azure, distributed systems and event-driven architecture , together with a solid understanding of software design and development principles.

Previous experience within Energy Trading is not required .

Rolling contract – extensions expected

Key Responsibilities

• Design and develop high-quality, scalable applications using C# and .NET 8+
• Build robust, distributed backend services and APIs
• Contribute to technical architecture and system design decisions
• Design and implement event-driven and distributed systems
• Develop highly maintainable, testable and resilient software
• Work with Azure and modern cloud-based technologies
• Contribute across the full software development lifecycle
• Take ownership of technical solutions and deliver high-quality production software
• Work closely with architects, engineers and business stakeholders to understand requirements and deliver effective solutions
• Apply modern engineering practices including CI/CD, automated testing, Agile delivery and code reviews
• Help drive the migration from legacy platforms towards a modern .NET architecture
• Identify opportunities to improve system performance, scalability, reliability and maintainability
• Mentor and support less experienced developers where appropriate

Key Skills & Experience

• Strong commercial experience with C# and .NET / .NET Core
• Strong experience with .NET 8+
• Proven experience building scalable backend services and REST APIs
• Strong understanding of SOLID principles, design patterns and software architecture
• Experience with distributed systems and event-driven architecture
• Experience working with Azure
• Strong understanding of asynchronous programming and messaging

If you're interested in this Senior C# .NET Developer opportunity, please apply with your most recent CV to

Senior .NET Developer | C# | .NET 8+ | Azure | Distributed Systems | Event-Driven Architecture | Energy Trading | Greenfield Development | £650/day Inside IR35

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