Senior Software Engineer C#

Full time, Part-time
Bachelor, Master
Apeldoorn

At Sioux Technologies Apeldoorn, it’s all about solving complex puzzles with smart software. No web apps or cloud-based tools — but high-performance software for high tech machines or devices. Using C# and sometimes other languages like C++, Python or Java, you’ll develop locally running software that forms the backbone of cutting-edge high-tech systems.

Sioux Technologies brings high-tech to life and contributes to a society that is healthier, safer, smarter, more sustainable and more enjoyable. We are a strategic high-tech solutions partner that develops, innovates and assembles complex high-tech systems with advanced Software, Mathware, Electronics and Mechatronics.

Our Position

You’ll work on application and control software for high-tech machines in industries like semiconductors, medical, or analytical equipment. Machine control to UI tooling and from data pipelines to synchronization logic — you’ll help design and build systems from the ground up.

How your daily challenge can be described:

  • Develop high-performance software using C# within the .NET framework
  • Take ownership of architecture, design, test strategy and versioning
  • Collaborate in tight-knit development teams at our Apeldoorn office or on-site with clients
  • Contribute to code quality through reviews, refactoring and CI/CD
  • Coach junior engineers and help shape our knowledge-driven culture

Spotlight project – Integrated test automation framework

For a client in the analytical market, we developed a hybrid software system that integrates device control, automated test sequences, and real-time validation. The orchestration layer and UI were implemented in C#, the hardware interface layer in C++, and the test scenario scripting in Python — offering the flexibility needed for continuous experimentation. Everything runs locally, ensuring low latency and high reliability, key in cleanroom environments.

Your future workplace

Your Experience

  • A bachelor’s or master’s degree in Computer Science or Software Engineering
  • 5+ years of experience in technical software development
  • Solid knowledge of C# and the .NET platform
  • Knowledge of other languages like C++, Python or Java
  • Experience with design patterns, system architecture, and agile environments
  • Familiarity with Agile/Scrum, CI/CD environments
  • Fluent in Dutch and English

Why Sioux Apeldoorn?

  • Software-only focus: Apeldoorn is Sioux's software powerhouse. No hardware distractions — just technical software challenges.
  • Quality mindset: Clean architecture, peer reviews, test coverage and software craftsmanship are not slogans — they’re how we work.
  • Freedom & trust: Choose your tech stack, suggest improvements, shape your role. We’ll back you.
Are you interested?

Your new job in 5 steps

Thank you for your interest. We are happy to share our selection process with you. Below you will find the steps we go through. If you have any questions, feel free to contact us. We wish you the best of luck with your application at Sioux Technologies!

  • Interested?
    • Send us your CV and motivation letter.
  • Application received
    • One of our recruiters will review your application and get back to you asap.
  • Introduction
    • We will plan an (online) introduction with a Sioux colleague to find out if there is a match.
  • Follow-up conversation(s)
    • In follow-up conversation(s), we dive into the (technical) depth. In some cases a personality test will be part of the conversation and will be discussed with you. In other cases you will be presented with a (technical) case.
  • Both excited?
    • If we are both enthusiastic, we would like to make you an offer. We will talk you through the offer and discuss it with you. Are you already curious about our terms of employment? You can find them here for the Netherlands, Belgium, Germany.
  • Welcome to Sioux Technologies!
    • We welcome you to Sioux and wish you success with your new challenge!

 

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Sagé Maenen

Talent acquisition
+31 (0)6 515 79 480
sage.maenen@recruitment.sioux.eu
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