Senior Developer .NET JP055181

ITProposal; Brussel Hoofdstad; Hybride; EUR 123 000 - 154 000; Plein temps

Résumé du poste

ITProposal in Brussels is seeking an experienced Senior .NET Developer to join a professional development team. You will design, develop and maintain robust, scalable .NET applications within a Microsoft stack, guiding other developers and collaborating with architects and analysts.

This role is hybrid, requiring a minimum of two days per week on-site in Brussels. The position starts September 2026 with a daily rate of €560–€700.

Qualifications

• Strong experience with C# / .NET and .NET Core.
• Experience with ASP.NET Web API, REST APIs, and MVC applications.
• Experience with Entity Framework Core and SQL Server.
• Experience implementing JWT/OIDC/claims authentication and authorization.
• Experience with unit and integration testing.

Responsabilités

• 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 JWT, OIDC and claims.
• Conduct code reviews and ensure adherence to development best practices.
• Write and maintain unit and integration tests.
• Collaborate with architects, analysts and developers in an Agile environment.

Connaissances

C# / .NET

ASP.NET Web API

REST APIs

Swagger/OpenAPI

Entity Framework Core

MVC

SQL Server

Authentication & Authorization (JWT/O…

Unit & Integration Testing

Blazor

Description du poste

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