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Medior Frontend Developer

Improve the user-friendliness of our webshop for millions of customers.

    Pros and cons

    • Improve the user-friendliness of our webshop for millions of customers.
    • Objectively consider technical choices, such as our architecture, tools, and processes, and don't cling too tightly to previously made choices or existing information.
    • Keep an eye on the performance of the webshop and analyze how you can improve this.
    • You have to choose between playing foosball, table tennis or pool, every day.


    'Good Morning!' Today is the start of a new sprint, in which you and your team will continue work on new search functionality. Together with a UX Designer, the team discusses how to approach the first story. You pair up with the PHP Developer to make sure the right data is available and then you focus for a while setting up semantically correct HTML, structured CSS, and Google-friendly JavaScript. Once you're done, it's already lunchtime. Wow, time sure flies! 

    Looking at your calendar, it appears a meeting is planned later with a couple of enthusiastic developers from another development team attempting to reduce the Time To First Byte by 20%. Of course you have some great ideas, with some extra time you are able to put together a proof of concept. At the meeting you proceed to demo your ideas and collaborate with the other team on several different approaches to improve our customer experience.

    Your specifications

    • You have a BSc or MSc in for example Computer Science. 
    • You have between 3-5 years of experience as a Front end Developer.
    • Strong experience with modern JavaScript (ES2017), HTML, CSS/SCSS and composition.
    • Experience with one or more modern JavaScript frameworks.
    • Experience in one or more server side languages such as PHP or C#.
    • Enforce code quality through Test Driven Development and linting.
    • Working in a fast paced Continuous Integration & Deployment environment gets you excited.
    • You're self-learning, independent, and have excellent problem-solving skills.
    • Working with Scrum/Agile working is second nature to you.
    • You know how Git works.
    • You're proud of your work and welcome all feedback.
    • You're fluent in English.



    Included by default


    • Money.
    • Over 30 training courses at our own Coolblue University.

    • An awesome workplace. With freshly prepared meals, monthly TGIF drinks, epic Coolblue parties, and an informal, playful office space.

    • 25 leave days. As long as you'll promise to come back.

    • Travel allowance and a retirement plan.

    • An office at the best possible location. It's only a short stumble away from Rotterdam Central Station. Or a 2-minute walk.

    • Relocation assistance, from a to z (if you live abroad).

    • Dutch language courses. To help you become a Rotterdammert.

    • An international work environment. With colleagues from places like Belgium, Spain, Australia, Mexico, and Italy.


    Questions about Software development vacancies?

    Questions about Software development vacancies?

    Else Else de Boer

    Application process

    1. Apply
    You've applied? Awesome. We'll get back to you as soon as possible.
    2. Introductory call
    One of our Recruiters will call you for a preliminary chat.
    3. First interview
    A Recruiter and a Developer will call you for a Skype interview to get to know you better and to answer any questions you might have.
    4. Meet & Greet
    If you live outside NL we'll fly you in to meet us, so we can show you your future workplace.
    5. Offer
    We'll make you an offer you can't refuse.
    6. Hired
    Just sign here, here, and here. Booyah! You're hired.

    Apply for this job

    Apply now if you're interested in this vacancy! Make sure you have the following documents ready to add to your application.

    • CV
    • Cover letter

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