Senior C# Developer

  • Rotterdam
  • Fulltime
  • Bachelor

You'll 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.

Apply now
Developer website Coolblue

Senior C# Developer

  • Fulltime
  • Rotterdam
  • Bachelor

How do I become 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? Jonne will explain how to do that.

You enjoy doing this

  • Working with various types of data stores, such as Oracle or Dynamo/Cosmos.
  • 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
  • Creating pull requests in the application GitHub repo.
  • Working on Git (and Github) and running tests in TeamCity.

This calendar makes you happy

Week 06

  1. MonMonday
  2. TueTuesday
  3. WedWednesday
  4. ThuThursday
  5. FriFriday
    1. Daily stand-up

      Daily stand-up

      Start with team. Short update about your tasks and progress

    2. Developen


      Continue my work on the stories.

    3. Pair Programming

    4. Personal development conversation with Bruno

    5. Processing feedback from stakeholders on new feature

    1. Daily stand-up

    2. Demo Hosting & Deployment

      Demo Hosting & Deployment

      Presentation results last month + upcoming projects.

    3. Developen

    4. Teamlunch


      Celebrating successes together.

    5. Catching up with Yuliya (Developer)

    1. Daily stand-up

    2. Developen

    3. Refinement


      What will the upcoming sprint look like and who will do what.

    4. Watch Pieter update

      Watch Pieter update

      Video-update from Pieter.

    5. Outdoor walk with Fernando

      Outdoor walk with Fernando

      To catch up

    1. Daily stand-up

    2. Developen

    3. Sharing knowlegde with the team

      Sharing knowlegde with the team

      Share all kinds of ideas with each other, so that you get a little better every day.

    4. (Digital) drinking coffee with your buddy

    5. Pair Programming

      Pair Programming

      Coding together

    1. Daily stand-up

    2. Meeting with teamlead

      Meeting with teamlead

      Discussing your personal development.

    3. Retrospective


      What went well last sprint? What could be better next sprint?

    4. Sprint planning

    5. Teamborrel

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.
  • 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. 
  • 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.
  • At this moment we all work from home. Ofcourse we help you creating the best home-office possible. Including a desk chair, laptop and blue colored garlands.
  • Working together in an international environment with colleagues from the Netherlands, Belgium, Spain, Brazil, Mexico, 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.
Like what you see? You can become a Coolbluer, apply now!
  • 1


    Go for it

  • 2


    It's for you

  • 3


    Open and shut

  • 4


    Go for the fridge

  • 5


    I do

Want to know more?

  • How does Coolblue adhere to the 1.5-meter rule at work?

    We adhere to the recommendations and guidelines of RIVM and the government, of course. This means that all colleagues from the main office work from home as much as possible. The interviews for your application will also take place via video calls.

    We’d be happy to have you at the office on your first day. So we can drink a cup of coffee and get to know each other a little better. At an appropriate distance, of course.

  • Can I keep developing myself?

    Coolblue University: learning at Coolblue, in a different way.

    With over 30 training courses in our own Coolblue University, you can get a little bit better every day. At Coolblue, we go back to school sometimes. But not by sitting there quietly and just listening. The training courses aren't boring, but interactive. You have to do exercises and have discussions with others. At the Coolblue University, we choose what we want to learn, so we can continue to develop en become real experts. For example, a Delivery Driver needs different training courses than a Customer Service Employe and a starter needs different courses than a manager.

Just contact Jonne den Boer
Freelancers, employment agencies, and recruitment agencies need not apply.
Jonne den Boer