At FitXR, we’re building the future of fitness - immersive workouts which turn movement into play, not punishment. We’re for the misfits: the ones who’ve always felt a little out of place in traditional fitness spaces. This is a new kind of community where movement is inclusive and everyone belongs.

We’re looking for a Senior Engineer to bring their React expertise into the 3D world and build interactive experiences that make movement genuinely fun. You’ll be joining a small, high-trust and fully remote team who are obsessed with learning fast and helping people move because they want to, not because they should.

What you’ll do 👀

• Lead the tech side of features from brainstorm to release - balancing speed, polish, and player joy
• Be the go-to React expert - setting best practices, performance tuning and helping us build smarter, not harder
• Team up with Designers, Product and Unity/Backend Engineers to make VR interfaces feel seamless and alive
• Help define how we build - bringing product thinking and technical insight to every sprint
• Share knowledge, raising the overall level of code craft and collaboration
• Push the limits of our React–Unity integration to unlock even richer player experiences

You should apply if ✅

You’re a proactive, product-minded engineer with:

• Strong React experience in production environments
• Proven ability to own projects end-to-end, balancing delivery speed with solid engineering principles
• Experience working in small, cross-functional teams
• Excellent communication - you keep people in the loop, surface blockers early, and stay cool in chaos
• Comfort with ambiguity - you can build clarity where none exists
• Curiosity about 3D, gaming, or VR - bonus if you’ve built something weird and fun before
• Perspective of AI as a teammate, not a threat - you’re leveraging AI to speed up your workflow, generate tests and help prototype ideas faster

Nice-to-have experience:

• Some Unity or VR development - professional or hobby!
• Backend development - C# preferred
• Automated testing pipelines

You shouldn’t apply if ❌

• You want a 200-page spec before you start coding
• You prefer working in a giant org where decisions move slower than patch notes
• You’re allergic to collaboration or ownership

Benefits

🏝 Unlimited paid leave policy

⏰ Flexible 40-hour working week (core working hours 10am - 4.30pm)

🌱 £800 per year learning budget and more when you need it

🧘 £900 per year wellbeing budget with the option to sacrifice some of this wellbeing budget for a private health insurance scheme through Vitality

🏡 £400 home office setup budget for things like a comfy chair, new desk, any accessories which make your work environment comfy

🪐A Meta Quest 3 to get you immersed in FitXR and the wider VR ecosystem

✈️Work from anywhere scheme to combine work and travel

👶 12 weeks fully-paid family leave which everyone, irrespective of gender or sexual identity, is entitled to from day one