Senior C# Software Engineer

As part of our expanding team, we are looking for a talented C# Software Engineer to join us in Rotterdam and contribute to impactful, high-tech client projects across a variety of industries.

The Position

As a C# Engineer, your main tasks will include:

• Designing, developing, and maintaining high-quality software applications using C# and the .NET ecosystem
• Translating technical specifications into robust, scalable, and efficient code
• Identifying, troubleshooting, and resolving complex technical challenges with innovative solutions
• Ensuring code quality through unit testing, code reviews, and adherence to best engineering practices
• Collaborating with cross-functional teams to deliver reliable and performant end-to-end solutions
• (Optional but valued) Applying your C++ knowledge in projects where native integration or performance-critical modules are involved

Your Profile

• Bachelor’s or Master’s degree (HBO/WO) in Computer Science, Software Engineering, or a related discipline
• 5+ years of professional experience in C#/.NET software development (Medior to Senior level)
• Solid understanding of object-oriented programming, design patterns, and software architecture principles
• Experience with modern .NET frameworks, tooling, and development workflows
• C++ knowledge is a strong plus
• Strong analytical and problem-solving abilities
• Excellent communication skills for effective collaboration with colleagues and clients
• Proactive mindset with eagerness to learn, improve, and explore new technologies
• Fluent in English (spoken and written)

Working Conditions

• Lease car with fuel card
• Possibility of hybrid working
• Monthly net expense allowance
• 27 vacation days, with the option to purchase up to 10 extra vacation days
• Pension scheme with no personal contribution required

What we offer

• Access to exciting projects in key sectors: Defence, Transport, Telecom, Finance
• A diverse client base: Collaborations with both large corporations and smaller players across the Netherlands
• A real career development plan: Continuous training, coaching, daily knowledge sharing
• An innovative and collaborative environment

About ALTEN

ALTEN is a world leader in engineering and technology consulting, with over 57,700 employees in more than 30 countries. We support major companies in their innovation, R&D, and digital transformation projects across sectors such as automotive, aerospace, energy, finance, life sciences, and telecommunications.

Present in the Netherlands for over 20 years, ALTEN operates from its offices in Eindhoven, Capelle aan den IJssel, Apeldoorn, Groningen and Amstelveen. Today, with a team of 600+ consultants, ALTEN offers a wide range of expertise across Engineering and IT fields. From Automotive to Railway, and Defence to Aeronautics, our experts deploy their knowledge to provide innovative solutions in a dynamic and forward-thinking environment.

Ready for a new challenge?

Take part in innovative and impactful projects at ALTEN.