Salary: £30,000 - 60,000 per year Requirements: Strong experience designing and building distributed, event-driven, cloud-native systems Expertise in .NET technologies (.NET Framework and .NET Core) using C# Strong API development experience (REST, GraphQL) Solid experience with relational databases (SQL Server, MySQL or similar) Experience deploying and managing applications in cloud environments (AWS, Azure or similar) Strong understanding of full SDLC including design, development, QA, and production support Experience building automated testing solutions for complex systems Exposure to microservices and serverless architecture Understanding of TDD, BDD, or similar development methodologies Knowledge of financial or trading platforms (desirable) Experience with FIX protocol (desirable) Familiarity with Java, JavaScript, or React (desirable) Experience working within Agile/Scrum environments Responsibilities: Design and develop distributed, event-driven systems Contribute to architectural decisions and technical direction Build and maintain APIs (REST/GraphQL) Develop cloud-native applications ensuring scalability, security, and high performance Work across the full software development lifecycle, from design and proof of concept to deployment and post-release support Mentor junior engineers and contribute to best practices Drive automation, testing, and DevOps maturity across the team Technologies: .NET Framework API AWS Azure C# Cloud DevOps GraphQL Support Java JavaScript MySQL REST React SQL Security Serverless TDD microservices ASP.NET Backend More: We are a global leader in financial markets technology and liquidity solutions, seeking to hire a Senior .NET Developer (Back End) to join our established engineering team. This role involves working in a high-performing Agile environment, focusing on critical cloud-native systems for global trading and data platforms. We offer a competitive salary, a hybrid working model with flexible options, performance-related bonuses, and clear career progression opportunities. Our organization is dedicated to engineering excellence, innovation, and continuous improvement, using modern technologies to deliver high-quality, resilient software solutions. last updated 11 week of 2026