Software Development Intern (C# .NET)

October 21, 2026

Intern

Amersfoort, Netherlands

Indeed

Keep in mind

Original vacancy is in Dutch
You will likely need Dutch for the job. The employer can confirm

Description

Graduation internship focused on a concrete software assignment in C# and .NET inside a high-tech laboratory environment. The intern joins an experienced development team working on a completely new software suite that forms the core of laboratory processes and supports thousands of daily analyses, workflows and data flows. The work covers backend development, APIs, system integrations and frontend development with Blazor, using Clean Architecture, SOLID and Domain-Driven Design, with AI-assisted development tooling. Guidance from experienced developers, code reviews and an internship allowance are part of the offer.

Responsibilities

Work on software development within the .NET ecosystem with C#
Contribute to the development of a new generation of software for laboratory processes
Learn to translate business processes into practical and sustainable software solutions
Get to know backend development, APIs, system integrations and frontend development with Blazor
Gain experience with scalable software development and architecture principles such as Clean Architecture, SOLID and Domain-Driven Design
Learn to work with AI-assisted development tools such as GitHub Copilot
Collaborate with product owners, business analysts, developers and testers in multidisciplinary teams
Get insight into code reviews and software quality processes
Work with Azure DevOps, Git and CI/CD pipelines
Gain knowledge of automated testing, quality assurance and continuous software improvement

Requirements

Enrolled in an HBO or WO programme in ICT, Software Development, Computer Science or similar
Knowledge of C# and modern .NET versions
Knowledge of APIs and object-oriented programming
Knowledge of SQL Server or comparable relational databases
Familiarity with Visual Studio and/or Visual Studio Code
Analytical and eager to learn, enjoys technical challenges
Interest in software quality and building sustainable software solutions
Willingness to grow in software architecture, Clean Architecture and Domain-Driven Design
Curiosity about AI-assisted development, Git, CI/CD, Agile and modern development methodologies

Conditions

Challenging graduation assignment aligned with your study programme and learning goals
Opportunity to work on innovative software projects used daily by colleagues
Guidance from experienced developers and hands-on experience with modern technologies
Internship environment where your ideas and input are valued
Informal working atmosphere with short communication lines and committed colleagues
Ample opportunities to develop both technically and professionally
Appropriate internship allowance