Senior .NET Developer – C# & Web API

Our client, a prominent organization in the public health sector, is looking for a Senior .NET Developer to design, develop, and maintain robust software solutions. The role involves delivering high-quality code and providing technical mentorship to the development team to foster a culture of excellence.

• Develop software components using .NET Framework and .NET Core.
• Design scalable and maintainable solutions in collaboration with the architecture team.
• Provide technical coaching and mentorship to team members.
• Conduct code reviews and ensure adherence to development best practices.
• Analyze functional requirements and translate them into technical solutions.
• Optimize system performance while ensuring security and maintainability.
• Evaluate and integrate new technologies that align with organizational objectives.

• 8+ years of backend development experience using C#, .NET Core, and .NET Framework.
• 3+ years of experience with ASP.NET Web API, MVC, and REST APIs including Swagger/OpenAPI.
• 3+ years of experience with Entity Framework Core and SQL Server.
• You possess experience with Authentication/Authorization protocols such as JWT, OIDC, and claims-based identity.
• You have a strong background in Unit Testing and Integration Testing.
• You bring a structured, solution-oriented mindset and the ability to lead technically.
• You are fluent in Dutch or French with a very good level of English.

Nice to Haves

• Experience with Blazor.
• Proactive approach to evaluating emerging technologies.

• Start date: 14/09/2026
• Duration: 4 months
• Work regime: Full-time
• Location: Brussels
• Working model: Hybrid
• Contract: open to both permanent employees and freelancers