Data Scientist - Machine Learning


Amsterdam, NL
  • Job Type: Full-Time
  • Function: Data Science
  • Post Date: 01/18/2021
  • Website:
  • Company Address: , Amsterdam

About Catawiki

Catawiki is the number one online catalogue and auction house for collectibles. Catawiki hosts over 160 weekly auctions in categories such as comic books, coins, stamps, art, model trains, wine, vinyl records, jewellery, ceramics, books, and many more!

Job Description

Catawiki’s purpose is to enable people to discover and obtain special objects that help them fulfill their passions. In doing so, we add some color & make the world a more interesting place.

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 deliver scalable and robust models, actionable insights and solid understanding. We help the company to define and evaluate success, and we empower everyone to prioritise based on impact.

So what's the job

As a 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 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.
  • Working with cross-disciplinary teams involving product owners, developers, UX designers, and business analysts in constructing hypotheses for improvements.

A little about you

  • Are an experienced (3+ years), all-around data scientist who is as comfortable diving into the internals of a model implementation as discussing new opportunities for ML with product stakeholders
  • Have a strong quantitative background (statistics, ML, sciences, etc.)
  • Are fluent in Python, capable with SQL, and you 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, Git, Docker, Kubernetes, Google BigQuery, Spark, Airflow.
  • An entrepreneurial mindset that enables you to get things done, even if that requires actions outside your own area or comfort zone.

The Catawiki Story

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 single day. As Europe’s fastest growing online auction platform, our mission is to make special objects available to everyone.

In fact, 14 million users are buying and selling on Catawiki every month. This means we are continually growing and always on the lookout for new talent.

Born and raised in The Netherlands, we started in 2008 as a platform where collectors could manage their collections online. Yet, times change, ideas evolve, and in 2011 we hosted our first online auction and we haven’t looked back since! We’ve now grown to 500 Catawikians working across 7 International offices and are proud to have maintained our start-up mentality.

Here’s what we can offer you

A diverse and international team with over 50 different nationalities, located in the heart of Amsterdam and Assen with an easy-going atmosphere.

The Catawiki Community gathers everyone together for everything from ‘CataFooty’ to International Food Festivals, Friday Drinks, Board Game Nights, Pub Quizzes and Boot Camps!

And there’s more! We also provide paid holidays, holiday allowance and a pension plan paid for by Catawiki.


Catawiki is committed to building a diverse company and diverse teams. That includes everyone, no matter your age, ability, gender, race, religion or sexual orientation. We welcome applications from underserved and underrepresented communities. If you’ve got a story to tell, come and join us.

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Disclaimer: Local Candidates Only
This company does NOT accept candidates from outside recruiting firms. Agency contacts are not welcome.