Senior Engineer

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