C# Developer

Client: Energy Trading Firm

Location: London, hybrid 2 days

Job Title: C# Developer - Exchange Trading Platform

Salary: Up to £130k

We’re hiring a senior engineer to help evolve and modernise a real-time exchange trading platform used within an Energy Trading firm.

This is not a typical ticket-driven development role. We’re looking for someone who can take ownership, challenge assumptions, identify weaknesses in existing systems, and help drive architectural and engineering improvements across a complex trading environment.

Responsibilities

• Develop and enhance a high-performance exchange trading platform in C#
• Work with live exchange connectivity and trading workflows
• Integrate with platforms such as Trayport, ICE, and other exchange APIs
• Review and improve existing codebase architecture and engineering practices
• Identify weaknesses, bottlenecks, and technical debt across the platform
• Collaborate closely with trading and business users to understand workflow and market behaviour
• Build and improve trading automation capabilities
• Contribute to technical direction and platform evolution

Essential

• Strong commercial experience with C#
• Strong SQL/database experience
• Experience working on exchange-based trading platforms
• Understanding of live order management and exchange interaction
• Ability to understand and improve existing complex systems
• Comfortable reviewing code critically and proposing better solutions
• Independent mindset with strong ownership mentality

Preferred

• Experience with Trayport
• Experience with ICE or other exchange connectivity platforms
• Kafka experience
• Commodity or energy trading experience

This is a permanent role which will require 2 days a week in the office