Cats, cats and AI-Native C# .NET Developers.

Company: Mongoose Gray
Apply for the Cats, cats and AI-Native C# .NET Developers.
Location: Greater London
Job Description:

Back-End Developer – Responsibilities

  • The Back-End Developer will work for a fast-paced startup in Central London.
  • The Back-End Developer will enjoy hybrid working.
  • The Back-End Developer will design and build robust server-side applications using .NET and C#.
  • The Back-End Developer will implement business-critical logic that performs heavy lifting at scale.
  • The Back-End Developer will design, query and optimise SQL Server databases.
  • The Back-End Developer will write efficient stored procedures, views and complex queries.
  • The Back-End Developer will develop and maintain RESTful APIs.
  • The Back-End Developer will ensure applications are performant, secure and resilient.
  • The Back-End Developer will deploy and manage services within AWS environments.
  • The Back-End Developer will work with AWS services such as EC2, RDS, S3 and Lambda.
  • The Back-End Developer will implement authentication and authorisation mechanisms.
  • The Back-End Developer will ensure adherence to cloud security best practice.
  • The Back-End Developer will identify and resolve performance bottlenecks across application and database layers.
  • The Back-End Developer will write unit and integration tests.
  • The Back-End Developer will participate in code reviews and architectural discussions.
  • The Back-End Developer will be comfortable with CI/CD pipelines and automated deployments.
  • The Back-End Developer will use version control systems e.g. Git.
  • The Back-End Developer will have a strong understanding of Agile methodologies.
  • The Back-End Developer will monitor logging, diagnostics and system health in production.
  • The Back-End Developer will have an excellent understanding of back-end engineering principles.

Still with us? Great. Please send us a CV and a covering letter convincing us that you actually enjoyed reading the above. We look forward to hearing from you.

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Posted: April 4th, 2026