C# .Net Developer

Senior C# / .NET Developer (Securities Lending & Repo) • Role Type: 6-Month Contract

• Location: London (Hybrid - 3 days onsite per week)


• IR35 Status: Inside IR35

Role Overview A leading global financial services and asset servicing institution is seeking an experienced Senior C# / .NET Developer to join a business-critical technology team in London.

This role focuses on designing, building, and supporting high-performance platforms for the firm's financing-related businesses, with a primary emphasis on Securities Lending and Repo workflows.

Required Skills & ExperienceCore Technical Skills: • Strong hands-on expertise in C# and .NET / .NET Core.

• Deep understanding of Object-Oriented Programming (OOP) and architectural design principles.


• Proven experience building and implementing REST / JSON APIs.


• Solid experience with relational databases (e.g., SQL Server).


• Familiarity with unit/integration testing and automated CI/CD pipelines.

Financial Domain Knowledge (Essential): • Proven background in Financing platforms, specifically Securities Lending, Repo, or Collateral/Margin management.

• Strong general knowledge of financial markets, with a specific focus on equities and bonds.


• Prior exposure to complex, highly regulated capital markets or financial services environments.

Nice to Have: • Experience with cloud platforms (AWS / Azure).

• Exposure to messaging technologies like Kafka

If interested, please apply here ASAP or share your updated resume to

Randstad Technologies is acting as an Employment Business in relation to this vacancy.

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