Do you get excited about building software that scales to millions of users? Are you the kind of engineer who doesn't just fix problems — but reshapes the way a team works? And does the idea of your code directly impacting the fitness experience of 4.7 million members across Europe sound like your kind of challenge? Then keep reading.
At Basic-Fit, technology isn't a support function — it's how we grow. Our clubs run 24/7 thanks to the software and hardware we build in-house, and our members manage everything from freezing their membership to tracking their workouts through our app. That means what you build truly matters — at scale, across 6 countries, every single day.
This Is What Your Role Looks Like
As a Senior Backend Developer, you're not just shipping features off a roadmap. You're a pivotal engineer who shapes how the team works, raises the bar on quality, and helps define our long-term engineering direction. You'll be working in Tilburg alongside a talented mix of React (Native) developers, Node.js developers, Product Owners, Designers, QA Engineers — and even a Talent Coach dedicated to your personal growth.
Your responsibilities will be:
Building and maintaining APIs that handle millions of requests without breaking a sweat
Defining Service Level Objectives for the APIs and systems in our platform
Driving structural improvements to work towards those objectives
Supporting teams with documentation, architectural design, and tackling complex bugs
Co-shaping the long-term engineering roadmap — you have a real say in what we invest in
Co-owning non-functional topics like security, privacy, and performance
Being a key driver in how we adopt AI in our development process (no prior experience needed — just curiosity and enthusiasm)
Your tech stack:
We build our applications with React, TypeScript, Tailwind, Storybook, Service Workers, Next.js and Playwright. Our APIs run on Nest.js, TypeScript, Prisma, Postgres, Redis, Azure EventGrid and Azure ServiceBus. To keep everything running, we use Heroku, Azure DevOps, New Relic, Akamai and GitHub Copilot.
Who Are You?
You're a problem solver at heart, with software as your weapon of choice. You understand that making real impact requires collaboration — you're not afraid to knock on doors to get things done. Scale and complexity don't intimidate you; they motivate you.
Additionally, we're looking for someone who:
Has demonstrated experience with at least part of our tech stack and loves sharing that knowledge
Understands how to manage risk and isn't shy about taking ownership
Thrives in a fast-moving environment where unnecessary rituals are kept to a minimum
Is eager to explore AI tooling in the development process
Is eligible to work in the Netherlands (we don't sponsor new work visas, but existing sponsorships can be transferred)
What We Offer You
At Basic-Fit, it's not just about work — it's about your growth. As a Senior Backend Developer, you'll have the freedom to make an impact and develop yourself in a dynamic, tech-forward environment.
What you can expect from us:
Learning & Development: Unlimited access to GoodHabitz and LinkedIn Learning
Career Growth: Plenty of opportunities for professional and personal development, plus a dedicated Talent Coach
Work Culture: An informal, international, and down-to-earth environment. We value working together, so we work 4 days in the office, 1 day from home
Innovation: Internal hackathons (sometimes even in the club!), and your ideas contribute to strategic engineering decisions
Salary: A monthly gross salary between €4.650 and €6.650 based on 40 hours, depending on your experience and background.
Perks & Benefits: Travel allowance, bike plan, health insurance discounts, remote work allowance, and a pension plan (52% contribution by Basic-Fit)
Fitness: Free Basic-Fit gym membership + access to our gym at HQ in Hoofddorp
Office: A great workspace in the Plan-T building, right next to Tilburg Central Station
About…