C# Developer

C# Developer C# Developer Location: Leiden , Netherlands Location: Application deadline: 25 September 2026 Reference number: 0571 Are you interested in being part of a company that shapes the future of space and cyber technologies? To have a job where you can contribute to real-world missions with long-term impact? Join our software development team in Leiden, the Netherlands, as a C# Developer. Working with C#, WPF, Blazor and PostgreSQL, you will help deliver innovative engineering and business applications, with an initial focus on data-driven solutions for the Dutch Ministry of Defence.

The following skills and experience are mandatory: A degree in Software Engineering or a related discipline. 3-5 years of experience developing applications in C# and .NET. Experience with WPF, Blazor, MVVM and PostgreSQL. Knowledge of Test-Driven Development (TDD) and software quality practices. Experience using Git, GitHub and/or GitLab. Strong problem-solving skills, with the ability to work both independently and collaboratively. Excellent communication skills and a customer-focused mindset. Fluency in Dutch and English, both written and spoken. The following skills and experience would be highly desirable: Experience working on large-scale software projects. Knowledge of CI/CD pipelines and modern development practices. Experience with data modelling (e.g. UML, Ecore). Familiarity with Linux, Docker, and web/mobile development using TypeScript or JavaScript. Eligibility Requirements At Starion, we are committed to building diverse and inclusive teams and encourage applications from all backgrounds. Please note that, due to security requirements linked to this specific assignment with the Dutch Ministry of Defence, candidates must hold Dutch nationality to be eligible for the role. Why should you apply? You will have the opportunity to work within leading space organisations across Europe. We encourage everyone to think outside the box and to push the boundaries of traditional knowledge. This role is an opportunity to join a forward-thinking company and allows for a deeper understanding of the industry. To be part of a company that values integrity, inspiration, care and collaboration. Benefits include: competitive remuneration packages; unique career opportunities, including working in other countries; access to training and development programmes; flexible relocation support. We are proud to be an equal opportunity employer, committed to achieving diversity within the workforce and creating an inclusive working environment. We therefore welcome applications from all candidates, irrespective of gender, sexual orientation, ethnicity, religious beliefs, age, disability or other characteristics. As part of our commitment to providing an inclusive and barrier-free recruitment process, we will provide reasonable adjustments and support to ensure neuro-diverse applicants or those with a disability or long-term condition can be their best during the recruitment process. Questions? Contact German Cingerli Recruitment Manager Interested in this job? Share this vacancy Apply now - C# Developer " * " indicates required fields Title (e.g. Mr, Ms, Mx, Dr) Name * First name Last name Email * Phone Upload your CV * Drop files here or Select files Accepted file types: txt, pdf, doc, docx, Max. file size: 10 MB, Max. files: 10. Other supporting documents Drop files here or Select files Accepted file types: txt, pdf, doc, docx, Max. file size: 10 MB, Max. files: 10. How did you hear about this job? Starion website I have been contacted by a Recruiter LinkedIn Indeed Glassdoor I know someone in the company Careers newsletter Job fair Search Engine (Google, Yahoo, etc) Other If you were contacted by a Recruiter, please share their name If ‘I know someone in the company’ please share their name If ‘Job fair’ please tell us which one If ‘Other’ please tell us more * I agree to the Terms of Use and Privacy Policy * * I agree to allow Starion Group to store and process my personal data in accordance with the Candidate Privacy Notice * Submit Δ Related jobs Permanent 1 October 2025 MBSE Engineer Location Leiden , Netherlands Deadline 7 September 2026

Starion provides engineering, consultancy and technology solutions for space, defence and critical infrastructure organisations across Europe. With over 30 years of expertise, we combine space engineering, digital technologies and innovation to deliver solutions that support world-leading missions and tackle some of society’s most important challenges. Tasks and activities The scope of work will include: Designing, developing and maintaining complex data-driven applications that support critical business and engineering activities. Building and enhancing design-critical software solutions used during the early phases of engineering and system development. Performing verification and validation activities to ensure software quality, reliability and performance. Optimising high-throughput collaborative systems, enhancing scalability, efficiency and user experience. Designing and developing supporting tools, frameworks and libraries that enable efficient software delivery and long-term maintainability.