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Jobinhalt

Youll build modern applications for Coolblue back’s office. We have a lot of friends, and they crave well-structured data and user-friendly, task-focused applications.
How do I become a Senior C# Developer at Coolblue?

You regularly participate in brainstorm sessions about user experience, data, and task flow with the UX Designer, Product Owner, and Data Scientists in your team. Besides that you will create disconnected, highly congruent, and testable code that can easily be maintained and is future-proof. Want to become Senior C# Developer at Coolblue? Read below if the job suits you

You enjoy doing this
  • Working with various types of data stores, such as Oracle or AWS.
  • Solving problems by using accepted best practices and principles, such as TDD/BDD, SOLID, and design patterns.
  • Coaching your medior colleagues.
  • Giving sprint demo’s
  • Share knowledge during pair programming and constructively comment on pull requests.
  • Working on Github and like writing automated tests to ensure software quality yourself.


You recognize yourself in the following
  • You have more than 5 years of experience as a C# Developer.
  • You have experience with software architecture and building .NET applications.
  • You have experience with Web API or MVC in .NET Core.
  • Working with Scrum/Agile working is second nature to you.
  • You know your way around with Microservices.
  • Having experience with front-end development (React), Javascript, HTML5 and CSS is a plus.
  • You have experience with automating and implementing recurring tasks in a CI/CD system.


This is what you’re looking for in a job
  • Money.
  • Travel allowance and a retirement plan.
  • Relocation assistance: from A to Z. We will make sure it goes well and give full support.
  • A flexible workplace. Work in the Netherlands where you like and meet your team a few times a month in our office in Rotterdam.
  • Over 30 trainings in our Coolblue University to get a bit better every day.
  • 25 leave days. As long as you promise to come back.
  • A discount on all our products.
  • A picture-perfect office at a great location. You could crawl to work from Rotterdam Central Station. Though we recommend just walking for 2 minutes.
  • An extraordinarily good work environment with colleagues who make you happy, epic (digital) Coolblue parties, pubquizzing, and other activities.
  • Working together in an international environment with colleagues from the Netherlands, Belgium, Spain, Brazil, Russia, and Italy, among others.
  • Room for new initiatives and ideas. We’re always open to those, whether you’ve been with us for a week, a month, or a year.
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Frist: 10-01-2026

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