Senior Engineer

FitXR is building immersive workouts that turn movement into play. They are seeking a Senior Engineer with React expertise to develop interactive 3D experiences. This role involves joining a small, high-trust, fully remote team focused on rapid learning and making fitness enjoyable. The engineer will lead features from brainstorm to release, act as the React expert, and collaborate with cross-functional teams to create seamless VR interfaces.

Must Have

• 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

Good to Have

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

Perks & 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

We usually respond within three days

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

Locations

UK, Spain

Remote status

Fully Remote

About FitXR

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FitXR is a fitness technology company working at the cutting edge of VR and MR, building a movement for movement.

We started life in 2016 in a garden shed in the UK. Today, we’re building FitXR, one of the top-downloaded apps on the Meta Quest store. We’ve raised close to $30m from top investors such as Maveron, Hiro, and BoostVC.

We've built a growing range of fitness studios, from box workouts with world-class trainers like Olympian Nicola Adams to immersive Zumba dance classes. While nothing compares to trying it yourself, you can watch a trailer here.

Our team is distributed across Europe and the US. We’re guided by our Principles of Play: four core beliefs about how we treat each other and our community. We make space for every voice, believe in the importance of a learner’s mindset, and prioritize team success over individual glory.

FitXR is available on Meta Quest 2 & 3 and has been downloaded by over a million people worldwide and featured in Forbes, Empire, T3, Washington Post, Men's Health, GQ and more.

FitXR have been rated one of the top 10 Most Promising Startups, #2 in Flexa's most flexible VR startups and #28 in Tempo's top 100 super startups to work for 🎉