Senior App Developer

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.

Your Role

As a Senior App 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 - and even a Talent Coach dedicated to your personal growth.

Your tasks:

• Working closely with Product and Design to build high-quality mobile experiences
• Taking ownership of the mobile application architecture and keeping the app scalable and maintainable
• Constantly improving the release process and ensuring stable iOS and Android releases
• Monitoring and improving app performance, stability, and crash rates
• Keeping up with the React Native/mobile ecosystem and constantly evaluating recent trends while scoping them to Basic-Fit context.
• Mentoring other developers and sharing (mobile) best practices

Your tech stack:

We build our applications with React Native, 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 do we offer you?

At Basic-Fit, it's not just about work — it's about your growth. As a Senior App 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:

• You will be working in an awesome office in the Plan-T building next to Tilburg Central Station.
• Training & development: Unlimited access to GoodHabitz and LinkedIn Learning.
• Career opportunities: Plenty of room for growth, both professionally and personally.
• Enjoyment at work: An informal, international, and down-to-earth working atmosphere. Because we value collaboration, we work four days a week in the office and one day from home.
• Innovation: Your ideas contribute to strategic projects that are directly visible to millions of members.
• Salary: A gross monthly salary between €4.650 and €6.650 based on 40 hours, depending on your experience and background.
• Secondary benefits: Travel expense reimbursement, bicycle plan, health insurance discount, home-working allowance, and pension scheme (52% premium paid by Basic-Fit).
• Sport: Access to our gym at head office.

About Basic-Fit

Basic-Fit is the European leader in the value-for-money fitness market, with more than 4.7 million members in 1,650+ clubs across 6 countries. We continue to grow and constantly improve.

Senior App Developer

• Location: Basic-Fit HQ NL Tilburg
• Time type: Full time