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

• 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 whilst 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.

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.

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