Join us

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Business Development Representative
  • Amsterdam, Netherlands
Product Owner EDC
  • Amsterdam, Netherlands
Customer Support Specialist
  • Amsterdam, Netherlands
Senior QA engineer
  • Amsterdam, Netherlands
Senior UI designer
  • Amsterdam, Netherlands
Legal Counsel & Compliance Officer
  • Amsterdam, Netherlands
Junior / Medior Full stack developer
  • Amsterdam, Netherlands
Sr. PHP backend developer
  • Amsterdam, Netherlands

About us

What we stand for

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We are the team behind Castor EDC (Electronic Data Capture), a web application that allows medical researchers to collect data for their clinical studies. We are one of the fastest growing HealthTech companies, having tripled our customer base in the last year. We are proud of the fact that our customers are our biggest growth engine. Once they use our product, they fall in love and tell their fellow researchers.

Our goal

Accelerate medical research

We want to accelerate medical research by unlocking the potential of every researcher. Starting with an easy to use and affordable EDC we want to help researchers throughout the entire medical research process. We believe that standardizing and reusing research datasets is key to meeting tomorrow’s healthcare challenges.

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Our EU Horizon 2020 Grant

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Our growth is accelerated by the fact that we have been awarded a €1.1M grant as part of the European Union Horizon 2020 SME (Small and Medium sized Enterprises) Instrument program (read more). This allows us to expedite our growth plans and develop our products much faster than anticipated.

"We are changing the way medical research is done, and with that improving healthcare worldwide."

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Derk Arts, MD, PhD
Founder & CEO


Recognition we've received

We were nominated for the Deloitte Technology Fast 50 Rising Star Award 2016. The Rising Star category is part of the Deloitte Technology Fast 50 and was specifically created for technology companies less than five years old. Companies are evaluated based on scalability, revenue potential and level of innovation. Read more about the Rising Star award on our website.
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Our team

International and passionate about research

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Our team consists of Healthcare and IT enthusiasts who are eager to contribute to the improvement of medical research. We have a diverse team, employing Dutch, Canadian, German, Swedish, Romanian and Indian staff. We briefly introduce everyone on our team page

Office life

How we work

We work in a healthy (low carb salad @ lunch, but also Fries Friday), efficient (no overhead!), and challenging environment. We have daily body breaks (see right) and frequent meditation sessions. Working with us also means having time for other important things in life. We love tech and are always finding new productivity hacks (in Slack, IFTT integrations, marketing automation, etc) to allow us to start the Friday drinks early 😀

Our quarterly team weekends is when we recharge and create memories!

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Our location

The wonderful city of Amsterdam

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Yes we're biased, but Amsterdam is a great city to work and live in! Small village feel, but lots of stuff going on and plenty to see. Canals, museums, great parties, parks and the rest of Europe is only a plane ride away from European hub Schiphol Airport. Take a look at the Amsterdam Expat Centers top 10 reasons to love Amsterdam. Our office is not down-town, but the metro there takes 15 minutes.

Perks & Benefits

A selection of what we have to offer

  • Help redefine medical research
  • Competitive pay with bonus potential
  • Free (healthy) lunch & snacks
  • 30 vacation days + 6 public holidays
  • Pension plan
  • Stock options for high performers
  • Courses and conferences
  • Choose your laptop
  • Friday drinks (and regular champagne)
  • Large office with space to work
  • Office shower (runs to the office!)
  • Smartest colleagues in the world


Paasheuvelweg 25, Wing 5D, Amsterdam

Castor HQ

Paasheuvelweg 25, Wing 5D
1105 BP, Amsterdam