Senior C# Developer

Company: Lorien
Apply for the Senior C# Developer
Location: London
Job Description:

Hybrid Working – London – 2 days a week on site.

Lorien’s leading banking client is looking for a Senior C# Developer to join them, working on a critical, high volume, transactional system. Contribute to the re-architecture and modernisation of the platform.

This role is based in London.

This role will be Via Umbrella.

Working in a Hybrid Model of 2 day a week on site.

Main skills needed

  • Delivers high quality code and system designs for the FX Deal Capture Platform
  • Contributes to the re-architecture of the platform to meet business growth ambitions.
  • Analysis of business and technical requirements
  • Liaise with stakeholders, team members and other domain experts to capture and elaborate business requirements across domains / systems
  • Accurate reporting to management regarding development initiatives and progress
  • Follow‑up on production issues.
  • Deliver high quality software. Ensure that the systems are designed for performance and reliability in production.
  • Degree level qualification (ideally in Computing or Engineering)
  • Excellent Software Engineering skills
  • Strong programming background with a particular emphasis on C#, .NET Core
  • additional knowledge of C++ would be beneficial
  • Domain expertise in a volume transactional system (FX, Equities or other financial transactions)
  • Experience of a working with a range of business and IT stakeholders
  • Experience of working with offshore development teams
  • Experience of business-critical system development, testing and support

Experience and knowledge of the following technologies

  • Webservices
  • XML
  • FTML
  • Database – Oracle/SQL
  • IBM MQ
  • Ability to liaise effectively with developers, business and other stakeholders
  • Ability to work effectively as part of a formal project process.
  • Strong analytical and interpersonal skills as well as reporting capabilities
  • Business oriented, positive, resilient, full of stamina with a clear focus on results and deliveries

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

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Posted: May 25th, 2026