Senior Data Scientist - Machine Learning

Who we are

A piece of the moon, a complete dinosaur skeleton, the Pope's hat, the world's smallest book - at Catawiki, we come across exceptional objects such as these every day. 

Catawiki is the leading online marketplace to buy and sell special objects. We offer over 75,000 special objects in auction every week — each reviewed and selected by one of Catawiki’s hundreds of in-house experts specialised in Art, Design, Jewellery, Fashion, Classic Cars, Collectables and many more.

We've sold 10 million unique items to date and it’s our mission to become the world’s most popular auction destination for special objects.

We’re an innovative, pioneering and fast-growing scale-up. If you think you can make a difference to our team, go ahead and apply.

Our Data Story

With ten-thousands of active items on auction every day, hundred-thousands of bids, millions of users, and billions of events, the Catawiki platform generates vast amounts of data. We collect this data centrally, using it to generate business insights, as well as powering machine learning models that enhance our user experience, optimize our workflows, and keep our platform safe. We believe in creating flexible models that can be applied to a variety of use cases, and in experimentation and iteration to hit the ground running and continually improve the tools we build.The Data Team, which covers the full data spectrum of Machine Learning, Analysis and Data Engineering, has a clear a mission within Catawiki:

Why: We believe that by using data in a smart way, we can build the best Catawiki possible. We want to have impact and see opportunities everywhere.

How: We are builders, thinkers and talkers. We collaborate closely with every department to create value for our customers. We think big and hold ourselves to high standards, because our work really matters for the future of the company.

What: As a result we create business value by delivering scalable, robust models and actionable insights and predictions. We help the company to find opportunities and understand success, and we empower everyone to use data to be successful.

So what's the job

As a Senior Machine Learning Data Scientist in the Data Team at Catawiki you will focus on delivering scalable and impactful data products. You’ll work closely with our product and development teams while implementing your work. This includes:

  • Building production-ready models that apply machine learning and advanced data science techniques within our product offering by writing robust and scalable code.
  • Finding data science opportunities by exploring our extensive mobile and web data, and applying machine learning and advanced statistics to tackle these real-world business problems.
  • Being pragmatic when needed but also able to go deep into a problem, applying your expert knowledge of machine learning techniques
  • Working with cross-disciplinary teams involving product owners, developers, UX designers, and business analysts in identifying improvements and new use cases for ML
  • Deploy scalable models using Kubernetes on cloud infrastructure, producing real-time, asynchronous, and batch predictions

Who you are 

  • You are an all-around data scientist with 5+ years of experience who is as comfortable diving into the internals of a model implementation as discussing new opportunities for ML with product stakeholders
  • Can use your broad skill set to solve challenging ML problems and have a high throughput.
  • Are familiar with a range of different ML techniques and use that to select a good solution for their projects.
  • Are able to considers the operating/deployment constraints of large models and implement solutions accordingly
  • Give guidance and unblock others in your team by supporting them with advice and new techniques.
  • Have a strong quantitative background (statistics, ML, sciences, etc.)
  • Are fluent in Python and capable with SQL
  • Have deployed ML models serving real time responses on a large scale
  • Have demonstrable experience in building robust data products that created value for the company you worked for.

The following are a plus:

  • Proven ability to extract meaning from very big datasets with little engineering support.
  • Experience with one or more of the following: PyTorch/Tensorflow, LightFM, Git, Docker, Kubernetes, Google BigQuery, MySQL, Spark, Airflow, Kafka, nginx, CI/CD, 
  • An entrepreneurial mindset that enables you to get things done, even if that requires actions outside your own area or comfort zone.

Where you'll be

This role is based in Amsterdam  but we can offer remote work from the following countries: France, Germany, Belgium, Italy, Spain and The U.K. We also offer an excellent relocation package for people living outside of the Netherlands.

Here’s what we can offer you

This is your chance to become part of a fast but sustainable growing tech company! You will have an exciting role in a young, fast-growing, dynamic & international organisation. You'll be part of an enthusiastic, highly motivated team of 800+ international Catawikians; you'll have big responsibilities and can really create something. Additionally you can expect:

  • An attractive Stock Options package  
  • Working with a top notch team acting on a champions league level in a super complex dynamic environment; you will learn a lot!
  • A diverse and international team with over 50 different nationalities.
  • A great office located in the heart of Amsterdam with an easy-going atmosphere.
  • Our entrepreneurial environment encourages everyone to take initiative and experiment with new ideas. You’ll actively contribute to the growth of the Catawiki platform.
  • Tailor-made trainings to facilitate your personal and professional growth
  • The fun part! Our Activity Committee plans everything from ‘CataFooty’ to International Food Festivals, Friday Drinks, Board Game Nights, Pub Quizzes and Boot Camps!
  • And there’s more! Paid holidays, holiday allowance and a fantastic pension plan paid for by Catawiki.

Our commitment to you 

Catawiki’s eclectic team represents an international and intergenerational mix of people from different professional and cultural backgrounds. We foster an inclusive and queer-friendly work environment, committed to making every Catawikian feel welcomed and empowered. Whatever your story, we encourage you to bring your unique perspective to the table.

Catawiki stands with Ukraine and encourages people displaced by the current conflict to apply. In addition to the several initiatives we’ve launched, we’re open to ideas on ways we can continue to support the humanitarian effort.

Our offices and new way of working

We’ve embraced an activity-based way of working, meaning our team can choose how they split their work week between home and the office, in line with our remote framework and guidelines. In locations where we have physical offices, most employees enjoy two days at the office to connect and collaborate with each other.

Our experts and sales staff in local markets work 100% remotely – in most cases from home. Some key positions are hired remotely, while we also offer relocation services for colleagues needing to be closer to the office.


Apply directly with an English CV and cover letter by submitting your information at the bottom of this page. By submitting your application you agree to Catawiki’s Applicant Privacy Policy.

If you’re excited about this role but your past experience doesn’t align perfectly with every qualification in the job description, we encourage you to apply anyways. You may be just the right candidate for this or other roles.

Flexible Working

We’re continually incorporating hybrid elements, while employees choose how they split their work between the office and home.

Excellent benefits
Our benefits are designed to ensure every Catawikian is energised, focused and thriving.
Recognition programme

We strive to be an employer where your impact is meaningful, visible and rewarded.

Receive new & relevant jobs

Fill in your details and we will keep you up to date with available jobs