Software Engineer – Trading Systems

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#

• .NET Framework 4.7.2 (WinForms)

• Microsoft SQL Server

• RabbitMQ

• In-house FIX engine

• Microsoft Azure

• Azure DevOps

• Excel VBA-based systems

• Fully in-house developed platform

Skills & Experience

Essential

• 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., RabbitMQ)

• Understanding of distributed systems

• Experience within 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 WinForms 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