RED is seeking an experienced .NET Developer on behalf of our client based in London for an initial 6-month contract to support a project with demanding technical requirements. This is a hybrid role based in London, requiring 3 days per week onsite, and we are looking for someone who can start immediately. This position requires strong hands-on expertise in .NET development, combined with solid experience across AWS, distributed systems, and databases. The successful candidate will be comfortable working on complex backend systems and delivering reliable, scalable, production-grade solutions. Key Responsibilities Design, develop, test, and maintain applications using C# and .NET / .NET Core Build and support scalable backend services and APIs Design and implement solutions within AWS cloud environments Contribute to distributed systems and service-oriented architectures Design, develop, and optimize database structures, queries, and transactions Diagnose and resolve performance, scalability, and reliability issues across applications and databases Collaborate with technical and non-technical stakeholders to deliver robust solutions Participate in code reviews, testing, and best practice implementation Support architecture and technical design discussions Required Skills and Experience Strong commercial experience with C# and .NET / .NET Core Proven experience building enterprise backend applications Solid hands-on experience with AWS Strong understanding of distributed systems, scalability, and resilience Strong database experience, including schema design, SQL, optimization, and troubleshooting Experience building and consuming RESTful APIs Familiarity with microservices and integration patterns Experience with source control, CI/CD, and modern software engineering practices Strong communication and problem-solving skills If this is something you are interested in, please send me an up-to-date CV and we can discuss the role in more detail. If you know someone who might be interested, please forward this advert their way