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Senior API Software Engineer Builder of APIs. Ambassador of the API first mindset.

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How do you make our customers happy? is transforming retail to simplify everyday life for 11.5 million customers. Not in a vacuum, but together with ~35,000 partner sellers who do business on our retail tech platform. We’re building revolutionary tools to help accelerate their success. For example our API, that 11,000 partners use to interact with the platform more efficiently. We’re still improving this API daily (ease of use, stability, scalability, speed, and so forth). Are you an experienced software engineer with a API first mindset, for whom high performance is a piece of cake and for whom stability has the highest priority? Please contact us!

Your responsibilities as Senior API Software Engineer

  • Develop and optimize our external API
  • Translate partner whishes into stable and high performance technical solutions
  • Advise, challenge and help other scrum teams with their connection to the API
  • Be the organization wide ambassador of the API first mindset

As API Software Engineer you are part of the sAPI team, which improves and innovates the API that helps 11k partner sellers conduct business on An impactful role for our partners, as well as for our mutual customers and the commercial performance of the entire platform, because ‘API partners’ account for roughly half of the total revenue. It’s up to you to determine how we should technically improve our scalable API solution, how we should extend and optimize it. You take ownership of the uptime and the stability. Dive deep under the hood of the API engine to analyze weaknesses and opportunities. Translate partner whishes to stable and high performance solutions and help set the priority of various initiatives. You promote the API first mindset to other scrum teams and advise and help them.

Why you can make the difference

Because you are a experienced senior engineer, which is not afraid of 3.5 billion monthly transactions per month. Because you like to write code but are experienced in helping and coaching of other engineers too. Because you love complex challenges and are only satisfied if solutions are perfect. And of course because you are a team player which also can convey your vision and ideas with panache, who is customer focused and wants nothing more than happy API users.

3 reasons why this is(n’t) for you

  • Yes, if you have more than 6 years of software development experience
  • Yes, if Java, Kotlin, Spring Boot, PostgreSQL and APIs are your cup of tea
  • Yes, if you have a strong technical focus and a team player too
  • No, if you have no affinity with APIs and technical innovations
  • No, if you find stability and performance uninteresting
  • No, if you are a loner and see cooperation as a necessary evil

Where you’ll work

At the premier online retail tech platform in the Netherlands and Belgium. A platform where 11.5 million Dutch and Belgian customers can choose from over 25 million articles. A platform that helps 35,000 commercial partners run their businesses. And a platform that will never be ‘finished’. has been reinventing retail since 1999, and we always will be. Together with our customers, partners and over 2,000 colleagues. And hopefully together with you. Let’s change retail together to simplify daily life. As Senior API Software Engineer, you’ll land in the multidisciplinary sAPI team that builds, maintains and improves the scalable public API. offers an attractive setting with a great atmosphere and a real drive to continuously develop all of our colleagues. And yes, we’re a market leader, but we feel more like a scale-up. Powered by self-organization and short lines of communication; the less bureaucracy, the quicker we can innovate. There’s no red tape here, but we might roll out a red carpet to welcome your great ideas!

What you get

What you get

  • A blue and safe landing

    We warmly welcome our new colleagues, so they feel home as soon as possible. During your onboarding program, we give you all the ins and outs about!
  • Money and more...

    Working at is challenging and therefore you get something in return. Besides salary, you will receive a yearly bonus, holiday allowance, holiday entitlement of 29 days, travel allowance, group insurance and more.

How it works

  1. Carefully, we take a look at your application. Within 2 weeks you know if we invite you for an interview.
  2. We call you to set up an interview. And since we’re already talking: feel free to ask any question you may have.
  3. In this first interview we’ll get to know each other. We want to find out more about you. Work experience is interesting, but we also want to find out more about you as a person. Together, we’ll find out if this job is a match made in heaven.
  4. Before the next interview we will ask you to take an online assessment. We’ll also discuss the position and your team in depth.
  5. 2 interviews are usually enough to see if it’s a match. And if you agree… well, it’s the beautiful beginning of your career at :)

Any questions? Contact

Apply right away Are you builder of APIs. And ambassador of the API first mindset?

CV/ resume (Word or PDF only, max. 10 MB))
Cover letter (Word or PDF only, max. 10 MB))