Engineering Team Lead (EMEA)

"Castor is doubling in size each year since 2018. We’re looking for energetic, seasoned engineers who have lived through this level of growth before and are ready to lead and build out lean engineering teams" - 
David Sigley, Head of Engineering at Castor

Castor is a leading cloud-based clinical data platform working with some of the world’s largest medical device companies, biopharma, and renowned academic institutes.

We simplify the clinical trial process, from recruitment to analysis, with user-friendly, patient-centric technology. Our mission is to bring medical research into the digital age. Why? Because medical research is still largely run using free-text, paper, and legacy technology.

Our self-service platform enables our users to run remote, device-enabled, patient-centric trials. By helping our users capture high-quality data and making it machine-readable, we are fundamentally changing the flawed evidence-based medicine process.

Our technical stack:

At Castor our tech stack, well… it’s stacked! With PHP at its heart, our world is composed of (but not limited to) PHP 7.4 (upgrading to 8), Symfony, Laminas, Github, Doctrine 2, CircleCI, Docker, MySQL, Ansible, ReactJS, Tideways, NewRelic, and DataDog to realize our vision, ensuring our products and tools embrace the frontier of innovation.

How is Castor supporting the Coronavirus crisis?

Castor has joined the global fight against the Coronavirus by making our research data capture system available for free for all COVID-19 research projects. Castor is supporting more than 250 COVID-19 studies across the world, including the World Health Organization’s SOLIDARITY trial.

What you’ll do

You will be leading a cross-functional agile team of Engineers and QA Specialists and supporting the hiring process of a rapidly scaling organization. You’ll do this by:

  • Identifying gaps in Engineering and resolving them through adjustments to our hiring plan;

  • Collaborating with and mentoring engineers, championing their technical growth;

  • Designing, building, and debugging cutting-edge technology that is being used by a growing number of medical researchers;

  • Analyzing performance data together with the rest of the team and optimizing bottlenecks;

  • Deconstructing stakeholder requirements to model optimal, scalable, solutions;

  • Ensuring your teammates are set up for professional and career development

What you’ll bring

Being a savvy and seasoned software engineer, you’re enjoying hands-on programming challenges and are eager to motivate others.

You’ll definitely have:

  • Experience in scaling up SaaS products and teams;

  • Extensive practical experience in at least one technical discipline for Backend, Frontend, or Infrastructure;

  • A positive approach to mentoring and supporting others in their development;

  • Experience in testing in an Agile environment;

It would be good if you had:

  • Experience managing and growing a remote engineering team in a scale-up;

  • Experience growing an Engineering department from 25 to 100;

What you’ll learn:

It’s a crucial time for Castor. We’re on ‘full power mode’ and scaling up at an exponential rate. For you, the opportunities are endless:

  • How to build robust ‘bulletproof’ security which protects patients medical data

  • To share your ideas openly and influence the growth of a true scale-up company

  • Be involved in maximizing the impact of medical research and improving healthcare

What you'll get:
At Castor we truly live and breathe our core values, believing we can 'achieve anything with a healthy and happy team.' With this in mind, we offer the following benefits:

  • A flexible and remote working opportunity (we also have an office in Amsterdam)

  • A competitive salary and a guaranteed 'happy holidays' bonus

  • Investing in our talent with a strong Employee Stock Option Plan

  • Unlimited annual leave (with a minimum of 25 days, plus additional national holidays)

  • Interested in lifelong learning? You’ll love using our development and training budget!

  • Flexible approach to working - nobody is tracking your time except you.

  • A MacBook or Dell laptop, we’re a tech start-up after all ;)

  • Like to feel zen? You’ll love our company subscription to Calm for meditation and yoga

To make medical research smarter and faster, and build top-notch products to support decentralized clinical trials, we pay close attention to diversity & inclusion in Castor’s Product and Engineering teams. You can learn more from our Team Lead Roxana and Software Engineer Luciana Interviews on how they experience working at Castor and their opinions on D&I in engineering topics!

Want to know more? Check out the role profile for some further insights, or apply now!

Castor continues to grow as an Equal Opportunities Employer. We strongly encourage applications from women, people of colour, and people from the LGBTQ(+) community. In your application, please feel free to share the pronouns you use (for example she/her/hers, he/him/his, they/them/theirs, etc).

Our Interview Process


Fill out a short application on our careers website.

Telephone Call
Telephone Call

If your application is successful, we’ll invite you to an intitial call with a member of our talent team.

Manager interview
Manager interview

Great news! You’re invited to meet the hiring team.

Interview Day
Interview Day

Now we’ve got even better acquanted, we’d like to invite you to a final stage interview day.


Congratulations! We’re making you a formal offer to join as our next Castorian!

Meet Your Future Colleagues

Roxana Christian
Roxana Christian
Senior Software Engineer
Sebastiaan Knijnenburg
Sebastiaan Knijnenburg
Principal Innovation Engineer
Bas van Vliet
Bas van Vliet
Senior Software Engineer