Senior Software Engineer (NodeJS)

Job description

Backend Engineer at OneFit

When the world gets more and more digitised, people are becoming at risk of being physically passive and mentally overloaded. We want to turn the tables and use technology to help our memberships to stay fit. To get there, we need you on our squad.

We are growing as a tech start-up into the scale-up phase (envision a scale-up as a startup on steroids ;D). To improve our product and services we need great people to bring the workout revolution into the world. We have a lot of exciting development challenges, especially as a back-ender. That’s why we need you.

OneFit is about

We are on a mission: One Fit Planet.

OneFit is a technology driven sports and yoga solution that helps its members to stay motivated and keep working out. We do this by offering a flexible monthly membership for a rainbow of workouts. From swimming to fitness, from yoga to padel, from boxing to pilates all available at your fingertips with our app. Choosing from over 60 thousand classes every month.

What can you expect as a backend engineer at OneFit?

Our platform transmits thousands of bookings and check-ins every hour in different countries and languages and in the near future also in different currencies and timezones. We are working on multiple integrations with other booking systems like MindBody, Virtuagym and many more using our venue API.  We have real time listings of workout availability and we make it possible for our users to see who else is doing that workout. We are working on efficient algorithms to engage our members and help them to reach their fitness goals. Our code quality standards are high and therefore on it self already pretty challenging. There is much more we want to build and so much more we can improve. As a backend engineer you will be working on a variety of projects like waitlist, churn prediction model, venue api, business intelligence, core stability and much more.


We believe in motivation over regulation. Developing the good way can only be done by a good team. We believe motivation is as important as skills for a team to be successful.

So we don’t ask you to be in at 9 am. Instead we want you to challenge standing ideas; be curious about new technologies and share your best practices because you want to.

What do we offer?

  • Competitive salary
  • Free OneFit membership
  • Company sponsored happy hours
  • Apple equipment
  • Education budget
  • Free lunch
  • Team trips and drinks
  • Flexibility

You will report directly to our CTO, Guy Rombaut.

Find more information in our Medium page:


Who are you?

  • 5+ years of experience in backend development
  • Relevant engineering skills- expert in NodeJS
  • Experience with CI/CD and devops: Cloud, Kubernetes, Docker, MongoDB, MySQL, Elastic, Kafka etc.
  • Experience with micro-services architecture and high performing API (GraphQL, RESTFul, multi-threading)
  • Experience in Front-End is a plus - Vuejs/Vuex or similar frameworks (e.g. React/ Redux)
  • Degree in Computer Science / Software Engineering or similar is a plus

What we offer

  • $$
  • Free OneFit membership
  • Company sponsored happy hours
  • Apple equipment
  • Education budget
  • Free healthy lunch
  • Flexibility
  • Unlimited Holidays


Apply directly with an English CV and cover letter by submitting your information at the bottom of this page.