Novancy is seeking a highly experienced Senior C# ASP.NET Core Developer to work remotely on a long‑term freelance basis. The role focuses on building robust backend services using ASP.NET Core 8, Entity Framework Core, and PostgreSQL, while ensuring high performance and scalability. Candidates must be proficient in asynchronous programming, design patterns, and unit testing with xUnit and Moq. Fluency in French is required, and knowledge of the payroll domain is a plus. This position offers the flexibility of remote work and the opportunity to contribute to complex, high‑impact projects.