Caspian One
Senior Software Engineer
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Securities Finance Developer (.NET)
London | Contract | Inside IR35 | Hybrid
Our client is seeking an experienced .NET Developer to join its Equity Technology team in London, working within a specialist Securities Finance technology group delivering strategic platform enhancements and regulatory-driven change initiatives.
This role will focus on the firm's established Securities Lending platform, supporting major modernisation initiatives across stock lending, settlement processing, SWIFT messaging, and T+1-related programmes. You'll work closely with developers, operations teams, and business stakeholders across London, the US, and Asia.
Key Responsibilities
- Develop and enhance core Securities Finance applications.
- Deliver changes across a large-scale Microsoft technology estate, including WPF,.NET, and SQL Server solutions.
- Contribute to platform modernisation and integration initiatives while maintaining compatibility with existing systems.
- Enhance settlement, messaging, and trade lifecycle processing capabilities.
- Work directly with business users, operations teams, and fellow developers to gather requirements and deliver solutions.
- Own projects and issues from design through to deployment.
- Produce high-quality technical documentation and automated tests.
- Leverage tools such as GitHub Copilot and Claude to accelerate development and improve code quality.
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Required Skills & Experience
- Strong commercial experience with C#/.NET development.
- Experience working with WPF desktop applications.
- Strong SQL Server development skills.
- Experience within complex enterprise or financial services environments.
- Strong communication skills and the ability to work independently.
- Proven ability to investigate requirements, overcome blockers, and drive delivery.
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Highly Desirable
- Securities Lending / Stock Loan experience.
- Prime Brokerage, Delta One, Equity Finance, or Equity Swaps knowledge.
- Exposure to trade lifecycle, settlement, or post-trade systems.
- Experience with WCF and legacy Microsoft platforms.
- Knowledge of SWIFT messaging.
- Experience using AI-assisted development tools such as GitHub Copilot or Claude.
Environment
- C# -.NET Framework /.NET Core
- WPF
- WCF
- SQL Server
- Jira
- BitBucket
- Bamboo
- GitHub Copilot / Claude
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