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 Core
• Implement asynchronous processing
• Integrate AI model APIs into backend systems
• Ensure performance, security, and reliability across applications

Required Skills and Experience

• Strong experience with C#, ASP.NET Core, and async/await
• Solid understanding of modern backend architecture and dependency injection
• Experience with Entity Framework Core, Git, and agile delivery

Desirable: Experience with Azure DevOps, Docker, performance testing, or Playwright

Benefits

• Private medical insurance, pension, life assurance
• 25 days holiday plus additional benefits and discounts
• Ongoing training, development, and knowledge sharing
• Hybrid working model (3 days in London office, 2 days remote)

Interview Process

• Stage 1: Screening call
• Stage 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.