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C# Developer

Job Type
Contract/Temporary
Location
London
Salary
Negotiable
Job Ref
BBBH187301_1787056748
Date Added
August 18th, 2026
Consultant
Lewis Baillie

C# Developer - FX Deal Capture & Post-Trade

Application, Services & Web UI Development | Tier 1 Front-to-Back FX Platform

Hybrid - 3 days/week in office

The Role

We're looking for a strong C# developer to join a Front-to-Back FX technology team, building and improving the systems traders and business users rely on every day for deal capture and post-trade processing. This is a hands-on development role within a small team supporting Tier 1, business-critical systems - the kind where your code is in production affecting live trading activity, not sitting in a backlog.

You'll be developing new functionality to support deal capture and post-trade workflows, refactoring existing code to improve reliability and releasability, and working closely with traders and front-line support to respond quickly when things need fixing or changing.

What You'll Be Doing

  • Developing new functionality for business users, focused on deal capture and post-trade activity
  • Building and maintaining REST/ASP.NET web services and the applications and UI layers that sit on top of them
  • Refactoring and improving the releasability of existing systems
  • Responding quickly to changing trader requirements and issues escalated from front-line support
  • Owning the full software development lifecycle for your work, from design through to deployment
  • Contributing directly to the architecture and design decisions of the systems you work on
  • Working confidently and directly with business users to understand and shape requirements

What We're Looking For

  • Strong, hands-on C# developer with a proven track record of delivery on live, business-critical systems
  • Detailed knowledge of the systems you've built - not just used - including having shaped their architecture and design
  • Strong communication and analytical skills; comfortable interacting directly with business stakeholders
  • A flexible, responsive approach to work, suited to a Tier 1 support environment
  • Solid grounding in good software design patterns and practices
  • Full SDLC experience

Technical Environment

  • C# / .NET 8
  • IIS-based REST / ASP.NET web services
  • NUnit
  • TeamCity, Jenkins
  • Python

Guidant, Carbon60, Lorien & SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.

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