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

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