Senior Software Engineer

Caspian One; Greater London; Hybrid; GBP 92,250 - 147,600; Full time

Job summary

Caspian One in London is seeking an experienced .NET Developer to join its Equity Technology team, focusing on Securities Finance platforms. You will work on WPF desktop applications, .NET/C#, SQL Server, and modernisation initiatives across global operations.

The role combines hands-on development with collaboration with business users and operations teams in London, the US and Asia. The ideal candidate has strong enterprise or financial services experience, excellent communication, and a track

Qualifications

• Strong commercial experience with C#/.NET development.
• Experience working with WPF desktop applications.
• 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.

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.

Skills

C#/.NET

WPF

Communication skills

Problem solving

Tools

WCF

SQL Server

GitHub Copilot

Claude AI

Job description

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.
• 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.