Advaun Oy builds software that helps businesses run better. We develop web applications, AI systems, healthcare and industrial software, as well as our own AI-powered ERP/MES platform for manufacturers. We are currently looking for a Full-Stack / Backend Developer with strong C# and ASP.NET experience to join our team in Helsinki/Espoo. In this role, you will focus on building REST APIs with C# and ASP.NET to interface with legacy application databases and support integrations with third-party products.

Responsibilities

• Design, build, and maintain REST APIs using C# and ASP.NET
• Work with legacy application databases and third-party integrations
• Use Entity Framework Core with Microsoft SQL Server
• Implement authentication and authorization with Keycloak and OpenFGA
• Design and document APIs with OpenAPI / Swagger
• Write clean, testable, production-quality code
• Build automated tests using MSTest, R...