Novancy seeks a highly skilled Senior C# ASP.NET Core Developer to join a remote team on a long‑term freelance contract. The role focuses on building high‑performance, scalable applications for the Temporary Work and Payroll industry, leveraging advanced C# concepts, Entity Framework Core, PostgreSQL, and unit testing frameworks such as xUnit and Moq. Candidates must demonstrate strong architectural design, asynchronous programming, and performance optimization skills, while working independently and delivering quality code. French language proficiency is required.