Senior Developer .NET JP055181

Senior .NET Developer Location: Brussels, Belgium Work Arrangement: Hybrid – minimum 2 days per week on-site Contract: Full-time Duration: September 2026 – December 2026, with potential extension Daily Rate: €560–€700 About the Role We are looking for an experienced Senior .NET Developer to join a professional development team working on robust, scalable and secure software solutions within a Microsoft technology environment. You will play a key role in designing, developing and maintaining .NET applications while providing technical guidance to other developers. You will work closely with architects, functional analysts and other technical stakeholders to translate business requirements into high-quality technical solutions. Key Responsibilities Develop and maintain software components using C# and .NET / .NET Core . Design scalable, maintainable and secure software solutions. Develop ASP.NET Web APIs, REST APIs and MVC applications . Work with Entity Framework Core and SQL Server . Implement authentication and authorization using technologies such as JWT, OIDC and claims . Conduct code reviews and ensure adherence to development best practices. Write and maintain unit and integration tests . Analyse functional requirements and translate them into effective technical solutions. Identify and resolve technical and performance issues. Contribute to application security, performance and maintainability. Evaluate and integrate new technologies where they provide business value. Provide technical mentoring and coaching to other team members. Collaborate with architects, analysts and developers in an Agile environment. Required Technical Skills Strong experience with C# / .NET and .NET Core ASP.NET Web API REST APIs REST / Swagger / OpenAPI Entity Framework Core MVC SQL Server Authentication & Authorization – JWT, OIDC, claims Unit and integration testing Experience with Blazor is an advantage. Professional Profile Strong analytical and problem-solving abilities. Structured and solution-oriented approach. Able to translate complex requirements into practical technical solutions. Strong technical leadership and mentoring skills. Excellent communication and collaboration skills. Comfortable working in changing technical environments. Quality-focused with a strong focus on maintainability, security and performance. Languages Dutch or French: fluent/native-level proficiency English: very good professional proficiency Practical Information Brussels, Belgium Hybrid working – minimum 2 days per week in the Brussels office Full-time contract Start: September 2026 Daily rate: €560–€700