.NET Developer | C# .NET | Energy Trading | ETRM | Hybrid – London | £900 | Inside IR35 | 6-Month Rolling Contract

.NET Developer | C# .NET | Energy Trading | ETRM | Hybrid – London | £900 | Inside IR35 | 6-Month Rolling Contract

A leading global financial services organisation, providing liquidity, market access and infrastructure services across commodities, financial markets and foreign exchange, is looking to hire a C# .NET Developer to join their Power & Gas Technology team.

This C# .NET Developer opportunity will see you playing a key role in the complete restructuring of a Front Office ETRM trading platform that supports a high-performing Energy Trading desk.

As a C# .NET Developer , you will be responsible for redesigning and modernising a mission-critical C# .NET trading platform, transforming a legacy application into a scalable, low-latency, event-driven system capable of supporting multiple Front Office traders operating across Power, Gas and Emissions markets.

Working closely with traders, quants and technology teams, you will take ownership of the platform architecture, driving the full software development lifecycle from solution design through to implementation and deployment, while ensuring the platform remains resilient, deterministic and capable of handling real-time market events under volatile trading conditions.

The C# .NET Developer will work within an Agile engineering team building modern trading applications using C# .NET 8 , Azure and on-premise technologies. You will be responsible for designing scalable event-driven solutions, implementing asynchronous messaging patterns, and delivering high-quality software that supports pricing, P&L, execution management and risk across the Front Office trading environment.

This C# .NET Developer role offers the opportunity to work with technologies including .NET 8, C#, Azure, SQL Server, Kafka, Solace, LINQ, Entity Framework, Angular and Event-Driven Architecture . As a C# .NET Developer , you will contribute to the modernisation of a business-critical ETRM platform while helping shape the long-term technology strategy for one of the industry's leading trading businesses.

Previous experience delivering Front Office Energy Trading , ETRM or real-time trading platforms is essential.

Hybrid working – 3 days on site - London

6-month rolling contract (extensions expected)

Technology context: C#, .NET 8, Azure, Kafka, Solace, SQL Server, LINQ, Entity Framework, Angular, Event-Driven Architecture

Key Responsibilities:

• Strong C# .NET development experience building high-performance trading applications
• Extensive experience with .NET 8 , C#, LINQ and Entity Framework
• Strong SQL Server experience designing and managing high-volume trading databases
• Experience designing low-latency, event-driven architectures using Kafka , Solace or similar messaging technologies
• Strong understanding of asynchronous programming, multithreading and real-time state management
• Experience building scalable cloud and on-premise solutions using Microsoft Azure
• Strong knowledge of clean architecture, SOLID principles and modern software engineering practices
• Ability to work closely with Front Office stakeholders, traders, quants and technology teams to deliver end-to-end trading solutions
• Previous experience within Energy Trading , ETRM , Commodities Trading or Financial Markets is essential

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