Full Stack Senior .NET Developer

Summary

We are looking for a senior .NET developer with a strong backend focus and solid frontend knowledge, who enjoys working both on existing (legacy) applications and on the modernization towards future‑proof solutions. You will play a key role in maintaining business‑critical systems and gradually shaping the technical future of our application landscape.

Responsibilities

• Design, develop and maintain backend‑driven web and API solutions using .NET Core, C#, ASP.NET (Web API / MVC).
• Maintain and modernize existing legacy applications (WPF / WinForms) and contribute to migration strategies towards more modern architectures.
• Build and consume REST APIs and ensure secure integration between systems.
• Contribute to frontend development using React and/or Blazor, in collaboration with designers and other developers.
• Ensure code quality through testing, reviews and documentation.
• Act as a senior reference point in the team and mentor less experienced developers.
• Think along about technical direction, architecture and future evolutions.

Qualifications

• 7-10 years of experience as a developer in a .NET environment.
• Strong experience with .NET Core, C#, ASP.NET, Entity Framework.
• Experience with React and/or Blazor.
• Familiarity with legacy Microsoft technologies (WPF / WinForms) or a strong willingness to work with them.
• Experience with REST APIs and application security concepts.
• Experience with CI/CD and Git; knowledge of containerization (Docker, OpenShift, Kubernetes) is a plus.
• Interest in cloud technologies (Azure is a plus).
• Strong problem‑solving skills, autonomous working style and sense of ownership.
• Ability to reflect on complex problems and know when to seek alignment.
• Fluent in English; Dutch is a plus.

Benefits

• A comprehensive mobility program that supports work-life balance.
• Continuous learning and professional development opportunities.
• A dynamic, innovative environment with real opportunities for growth.
• A people-centric culture with a strong focus on wellbeing and health initiatives.