(Junior) C# Developer

Starion; Leiden; On-site; EUR 55,000 - 85,000; Full time

Job summary

Starion in Leiden, the Netherlands, is seeking a C# Developer to join its software team. You will work with C#, WPF, Blazor and PostgreSQL to deliver data-driven applications for the Dutch Ministry of Defence, with an emphasis on high-quality software for critical systems.

This role suits recent graduates with practical experience or engineers with a few years in the field, offering opportunities to design, develop, test, and maintain complex software across frontend and backend layers, in a

Qualifications

• Degree in Software Engineering, Computer Science, or related discipline.
• Experience building applications with C# and .NET.
• Strong frontend and backend development background.
• Relational database experience, preferably PostgreSQL.
• Strong problem solving and customer-focused communication.
• Fluency in Dutch and English (written and spoken).

Responsibilities

• Design, develop, and maintain data-driven applications for critical business and engineering activities.
• Build and enhance software solutions used in early phases of engineering and system development.
• Perform verification and validation to ensure quality, reliability and performance.
• Optimize high-throughput collaborative systems for scalability and user experience.
• Develop tools, frameworks and libraries to enable efficient delivery and maintainability.

Skills

C#

NET

Frontend and Backend

PostgreSQL

Problem solving

Communication

Dutch & English

Education

Software Engineering / Computer Science degree

Tools

WPF

Blazor

MVVM

Git / GitHub / GitLab

TDD

CI/CD

UML / Ecore data modelling

Job description

Are you interested in being part of a company that shapes the future of space and cyber technologies?

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. This position is well suited to both recent graduates with relevant practical experience and software engineers with a few years of professional experience.

About Us

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

• 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.

Skills and experience

• A degree in Software Engineering, Computer Science, or a related discipline.
• Experience developing applications using C# and .NET.
• A solid background in both frontend and background application development.
• Proficiency in working with relational databases, preferably PostgreSQL.
• 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:

• Familiarity with Git, GitHub and/or GitLab.
• Hands-on knowledge with WPF, Blazor, MVVM.
• Knowledge of Test-Driven Development (TDD) and software quality practices.
• Experience working on large-scale software projects.
• Knowledge of CI/CD pipelines and modern development practices.
• Experience with data modelling (e.g. UML, Ecore).

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.