Job Title

Role: Expert .NET Developer – Cross Asset Trading SystemLocation: Very Flexible. Can offer Remote with occasional travel to London City officesContract: 12 monthsRate: Up to £750/day (OUTSIDE IR35)About the Role:We are partnering with a leading investment bank on an ambitious programme to modernise and enhance their cross-asset trading systems. This is a technically challenging, hands-on role, ideal for an expert .NET developer with a strong SQL Server background and experience working in financial environments.You will be joining a highly skilled team focused on performance, reliability, and scalability, tackling complex issues in real-time, data-driven applications. This is purely a tech-heavy role—business knowledge is helpful but not required.What You'll Be Doing:Design, develop, and maintain RESTful APIs using .NET technologies (C#, Core).Redesigning and refactoring high-activity tables to improve performance and maintainabilityDeveloping frameworks and tooling for real-time monitoring of trading systemsModernising and upgrading legacy codebases, driving best practices in .NET developmentWhat We're Looking For:Expert .NET Developer: Deep knowledgeSQL Server Proficiency: Strong fundamentals in querying, table design, and ETL processing large datasets (performance tuning not required) Expertise: Familiarity with EntityFramework or other ORMs is a plus, but not essentialAsync & Multithreading Mastery: Experience in low-latency, data-driven applicationsDesign and build scalable, high-performance back-end services using .NET9.Familiarity with containerization and orchestration (Docker, Kubernetes) is a plus. Experience with CI/CD pipelines and automated testing frameworks.Attention to Detail: Ability to spot rare, critical issues before they reach productionPrevious experience in the finance industry, ideally in trading systemsWhy This Role Is Exciting:Work remotely while tackling cutting-edge technical challengesCollaborate with a high-performing team on a strategic, high-impact programmeInfluence system design, architecture, and long-term performance improvementsCompetitive daily rates up to £750If you're a highly skilled .NET developer who thrives in challenging, high-stakes environments and loves working with complex, real-time systems, this is the perfect opportunity to make an impact.