Senior .NET Developer Job ID: JP054464

Location: Brussels (Hybrid – minimum 2 days/week on-site)

Languages: French or Dutch (C2 level) and English (C1 level)

Work Model: Hybrid

Overview

We are looking for an experienced Senior .NET Developer to design, develop, and maintain robust Microsoft-based software solutions. You will play a key technical leadership role, ensuring high-quality code, scalable architectures, and reliable application performance while mentoring other developers within the team.

Key Responsibilities

• Develop and maintain enterprise applications using C#/.NET Framework and .NET Core.
• Design scalable, secure, and maintainable technical solutions in collaboration with architects.
• Translate business and functional requirements into technical implementations.
• Conduct code reviews and promote development best practices.
• Mentor and coach development team members.
• Ensure application quality, performance, security, and maintainability.
• Optimize system performance and troubleshoot complex technical issues.
• Evaluate and integrate new technologies aligned with business objectives.
• Participate in unit and integration testing activities.

• Expert knowledge of C# / .NET (Core and modern .NET versions).
• Strong experience with ASP.NET Web API.
• Solid knowledge of Entity Framework Core.
• Experience with Blazor and MVC frameworks.
• Strong understanding of REST APIs, Swagger/OpenAPI, and API design.
• Experience implementing authentication and authorization mechanisms (JWT, OIDC, Claims-based security).
• Strong SQL Server development and optimization skills.
• Experience with unit and integration testing frameworks.
• Familiarity with software architecture, security best practices, and performance optimization.

• Strong analytical and problem-solving abilities.
• Structured and solution-oriented mindset.
• Technical leadership and mentoring capabilities.
• Excellent collaboration and communication skills.
• Adaptability and resilience in changing technical environments.

• Senior-level .NET development experience in complex enterprise environments.
• Comfortable working across the full software development lifecycle.
• Able to lead technical discussions and influence architectural decisions.
• Passionate about code quality, continuous improvement, and knowledge sharing.

• Hybrid working model with at least 2 days per week on-site in Brussels.
• Teleworking permitted within Belgium.
• Flexible working hours and long-term project environment.
• Opportunity to work on impactful public-sector digital transformation initiatives.