Software Engineer, Backend Developer, Cloud Engineer - Software

Location: London (City) – Hybrid / On-site / Remote**

We are a London-based financial trading firm seeking an experienced Software Engineer to join our development team and support the ongoing evolution of our in-house trading and brokerage systems.

This is a hands-on, business-critical role within a fast-paced trading environment. You will work directly with the Head of Development and collaborate closely with trading, operations, and infrastructure teams to maintain and enhance a proprietary platform used daily across Europe, the US, and Asia.

The Opportunity

You will play a key role in developing, supporting, and modernising core trading systems covering trade booking, P&L and risk capture, confirmations, reporting, and messaging integrations.

This role combines active software development with live production support and direct engagement with front-office stakeholders.

Key Responsibilities

• Design, develop, and maintain in-house trading and booking systems
• Contribute hands-on to daily development in C# / .NET
• Review and improve code quality, performance, and security
• Support architectural decisions and technical roadmap initiatives
• Enhance system stability, scalability, and resilience
• Assist in modernising legacy applications, including migration initiatives
• Provide support within live trading environments
• Diagnose and resolve complex technical and business-critical issues
• Translate business requirements into effective technical solutions
• Coordinate with Infrastructure and IT Support teams

Technical Environment

• C#
• Microsoft SQL Server
• In-house FIX engine
• Excel VBA-based systems
• Fully in-house developed platform

Skills & Experience

• 5+ years’ professional software development experience
• Strong expertise in C# and .NET (modern .NET advantageous)
• Experience maintaining and enhancing legacy systems
• Solid SQL Server and database design knowledge
• Experience with message brokers (e.g., Rabbit
  
  MQ)
• Understanding of distributed systems
• Experience with in financial services, brokerage, or trading environments
• Knowledge of equity and/or derivatives trading workflows
• Strong analytical and problem-solving skills
• Ability to operate effectively in high-pressure, business-critical environments

Highly Desirable

• Trading platform or booking system experience
• FIX protocol knowledge
• VBA experience
• Experience migrating Win Forms applications to modern architectures
• Azure cloud architecture exposure
• CI/CD and automation experience

Profile

We are looking for a motivated, commercially aware engineer who is:

• Comfortable working with responsibility and autonomy
• A strong communicator across technical and non-technical teams
• Pragmatic and solution-focused
• Willing to take ownership and contribute beyond defined responsibilities

What We Offer

• High-impact role within a growing financial firm
• Direct exposure to live trading systems
• Competitive compensation package
• Flexible working arrangements
• Opportunity to contribute to the long-term evolution of a proprietary trading platform