Senior .NET Developer

At Schuberg Philis, we create, deliver and operate mission-critical IT systems where reliability, security and quality are absolute priorities. We take full ownership across the entire lifecycle — from initial planning through development to ongoing operations — ensuring systems perform consistently under all conditions. Our engineers work in environments where failure is not acceptable and maintaining high standards is essential.

We are looking for a Mission-critical Software Engineer (.NET) to help rebuild a complex business application into a modern, cloud-native solution on Azure.

You will work in a small team of engineers to analyse existing functionality, design clear and robust .NET services and APIs, and prepare the system for long-term, reliable operation. We make strong use of automation and GenAI-assisted tooling to speed up understanding and refactoring, but engineering judgement remains central.

Please note: We are not able to consider candidates who are not living and working in the Netherlands. At this moment, we are not providing relocation sponsorships.

Your work will include

• Designing and implementing backend services and APIs in C#/.NET (Core/6+).
• Translating existing business rules and workflows into clean, testable code.
• Adding tests and observability to ensure behaviour and performance remain correct during migration.
• Collaborating with Azure/DevOps engineers on deployment, security and runtime concerns.
• Helping define patterns and standards for a modular, maintainable target architecture.

You bring

• Fluency in Dutch
• 5+ years of hands-on backend experience, mainly in C#/.NET.
• Solid understanding of software design (DDD, clean architecture) and automated testing.
• Experience building cloud-ready services using SQL and modern APIs (REST/gRPC).
• Interest in working with existing systems and making them future-proof.
• Curious about using tooling like GitHub Copilot or other AI assistants to support your work.

If you enjoy solving real, messy problems in production-grade systems and like seeing what you build run reliably in the real world, this role is for you.