Senior C# Developer

Confidential

Naarden, Noord-Holland, Nederland permanent

Posted: January 30, 2026

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Quick Summary

We are looking for a Senior Developer to join our team in The Netherlands to develop and maintain our software.

Required Skills

C# C# .NET ASP.NET Entity Framework MS SQL Server Azure CI/CD Data Security Software Security API Management Agile Development Problem Solving

Job Description

Digital Resilience
At Yellowtail Conclusion, we develop software that strengthens digital security in one of the most digitized countries in the world: the Netherlands. One of our flagship products, Key Control Dashboard (KCD), enables organizations to manage risks effectively through smart, user-friendly technology.

To keep innovating, we’re looking for a Senior Developer. In this role, you are responsible for the technical realization of developing and maintaining our software, together with the team based in The Netherlands.

Why is Senior C# Developer your next job?
As a Senior Developer, you are responsible for influencing, designing, and building roadmap items. You are hands-on in resolving technically complex issues for our customers, collaborating with our development team. You consistently consider the 'bigger picture' for both our customers and for KCD. There are ample opportunities within KCD to truly leverage your specific skills and qualities.

• You can play a vital role in both modernizing the application and add new innovative functionality;

• We encourage learning and experimentation. Have an idea to improve performance or user interaction? We want to hear it, and help you test it;

• Growth and ownership. You’ll be trusted with real responsibility, contribute to technical decisions, and mentor junior developers as part of a collaborative team;

• We truly value your talent and want to support your growth. At KCD, you will have ample learning opportunities and the freedom to discover your strengths.

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