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.

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.

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

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

• 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

• 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

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

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

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UK & Europe:
Middle East + Asia: