C# Dot Net Software Developer with Fixed Income and FX

Company: Nexus Jobs
Apply for the C# Dot Net Software Developer with Fixed Income and FX
Location: London
Job Description:

Overview

In this role you will design and enhance a middleware platform for a niche FX brokerage, collaborating with traders and the CTO to deliver robust trading-related software. You will work on re-architecting the middle office, pricing toolsets, and integrations to external APIs, while maintaining existing platforms. The position offers strong autonomy in a fast-paced, delivery-focused environment with meaningful impact on the business. This is an opportunity to shape critical trading technology within a growing firm.

Responsibilities

  • Re-architect and build the in-house middle office platform and integrate with a new trading platform
  • Develop pricing toolsets
  • Integrate with external reporting/tradeflow and pricing APIs
  • Maintain daily operations on existing platforms

Key requirements

  • 3–5 years of Microsoft web technologies experience (C#, ASP.NET Core MVC)
  • Relational database experience (SQL Server)
  • Proven ability to build relationships with stakeholders (sales, brokers, middle office, external vendors)
  • Ability to produce clean, well-written, fully tested production-ready software
  • Stakeholder relationship building
  • Proactive communication
  • Collaboration with cross-functional teams
  • C# / .NET development
  • ASP.NET Core MVC
  • SQL Server

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Posted: September 30th, 2026