Senior Back End Developer

Senior Backend Developer - Digital Agency (C# / ASP.NET Core) Location: London (Hybrid: 3 days in office, 2 days WFH) Salary: £70,000 + Benefits TDL are working with a global digital agency who deliver large-scale websites, apps and platforms for leading international brands. We are seeking a Senior Backend Developer to support the delivery of high-performance systems and emerging AI-driven solutions. This role is open because of continued use of contractors by this company so a stable need to grow the permanent team. The Role You will be responsible for developing robust backend services and integration layers across complex digital products, including work involving AI APIs and RAG workflows. Key Responsibilities Develop scalable services using C# and ASP.NET CoreImplement asynchronous processingIntegrate AI model APIs into backend systemsEnsure performance, security, and reliability across applications Required Skills and Experience Strong experience with C#, ASP.NET Core, and async/awaitSolid understanding of modern backend architecture and dependency injectionExperience with Entity Framework Core, Git, and agile deliveryDesirable: Experience with Azure DevOps, Docker, performance testing, or Playwright Benefits Private medical insurance, pension, life assurance25 days holiday plus additional benefits and discountsOngoing training, development, and knowledge sharingHybrid working model (3 days in London office, 2 days remote) Interview Process Stage 1: Screening callStage 2: Face-to-face interview If you have prior experience working as a .NET Backend Developer in a Digital Agency please email Mike@thedeveloperlink.io with your CV and the subject line "Agency" for faster review as this is a big bonus for them.