We''re looking for an experienced Senior Software Developer to join a highly technical engineering team developing systems that directly support trading strategies, automated trading, and quantitative research.This opportunity suits a strong C#/.NET engineer who enjoys complex technical challenges, performance-critical development and influencing how software is designed and built. Working across greenfield projects and established platforms, you''ll take ownership of significant development work and help shape architecture, technical direction, and engineering standards. You''ll collaborate closely with quantitative researchers, traders, and experienced engineers, translating complex requirements into reliable, scalable software. This is a full-time office based role in central London.The Role:Design and develop high-performance applications using C# and modern .NET.Own complex projects from initial requirements and technical design through to production.Shape architecture and contribute to key technical decisions.Build scalable systems supporting trading, research and data-intensive applications.Develop and optimise relational database solutions using SQL Server, Oracle or similar technologies.Investigate performance bottlenecks and improve application and database efficiency.Apply multithreading, concurrency and asynchronous programming to demanding engineering problems.Strengthen software quality through code reviews, automated testing and continuous integration.Mentor ..... full job details .....