Senior Backend Developer (Node.Js)

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.

This Is What Your Role Looks Like

• 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)

Tech Stack

• React, TypeScript, Tailwind, Storybook, Service Workers, Next.js and Playwright
• Nest.js, TypeScript, Prisma, Postgres, Redis, Azure EventGrid and Azure ServiceBus
• Heroku, Azure DevOps, New Relic, Akamai and GitHub Copilot

Who Are You?

• 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

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

• 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

Perks & Benefits

• Travel allowance, bike plan, health insurance discounts, remote work allowance, and a pension plan (52% contribution by Basic-Fit)
• 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