Senior Software Engineer

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

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• Develop and enhance core Securities Finance applications.
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• Deliver changes across a large-scale Microsoft technology estate, including WPF, .NET and SQL Server solutions.
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• Contribute to platform modernisation and integration initiatives whilst maintaining compatibility with existing systems.
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• Enhance settlement, messaging and trade lifecycle processing capabilities.
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• Work directly with business users, operations teams and fellow developers to gather requirements and deliver solutions.
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• Own projects and issues from design through to deployment.
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• Produce high quality technical documentation and automated tests.
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• Leverage tools such as GitHub Copilot and Claude to accelerate development and improve code quality.
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Required Skills & Experience

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• Strong commercial experience with C#/.NET development.
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• Experience working with WPF desktop applications.
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• Strong SQL Server development skills.
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• Experience within complex enterprise or financial services environments.
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• Strong communication skills and the ability to work independently.
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• Proven ability to investigate requirements, overcome blockers and drive delivery.
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Highly Desirable

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• Securities Lending / Stock Loan experience.
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• Prime Brokerage, Delta One, Equity Finance or Equity Swaps knowledge.
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• Exposure to trade lifecycle, settlement or post-trade systems.
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• Experience with WCF and legacy Microsoft platforms.
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• Knowledge of SWIFT messaging.
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• Experience using AI-assisted development tools such as GitHub Copilot or Claude.
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Environment

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• C#
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• .NET Framework / .NET Core
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• WPF
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• WCF
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• SQL Server
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• Jira
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• BitBucket
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• Bamboo
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• GitHub Copilot / Claude
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