FitXR • Remote, United Kingdom

Senior Back End Engineer


Core hours 10–4.30

Job Description

FitXR is a fitness technology company working at the cutting edge of VR and MR. We’re a funded scale-up on a mission to impact more lives than any other fitness company, and build a healthier world for everyone.

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 $40m from top investors such as Maveron, Hiro, BoostVC and TriplePoint.

We’re a remote-first team of just under 100 people from across the US, UK, and Spain, and we’re committed to making it simpler and more enjoyable for people to get moving. We believe that anybody can fall in love with fitness and make movement part of their life.

Our team is distributed across Europe and the US. We’re guided by our Principles of Play: eight 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.

The FitXR app contains a growing range of fitness studios, where members can choose from box workouts with world-class trainers like Olympian Nicola Adams, powerful HIIT workouts, and immersive dance classes. While nothing compares to trying it yourself, you can watch a trailer here.

FitXR is available on Meta Quest 2 and has been downloaded by over a million people worldwide. Featured in Forbes, Empire, T3, Washington Post, Men's Health, GQ and more. In 2022, FitXR ranked 6th in The Information’s 50 Most Promising Startups.

The Role

As a Senior Back End Engineer, you will be crucial in developing massively scalable backend services for our VR fitness game platform. This includes working on our newly implemented set of Microservices in .NET 6 and building the backend in exciting new applications for Meta Quest, Pico and more VR and XR platforms.

You will also work with our Unity developers and external partners to integrate our services with Unity Game Engine or in exciting new ways, while we explore new methods for disrupting fitness in Virtual and Mixed Reality.

This is a one-of-a-kind opportunity to work with exciting new technology in a growing team and to help us redefine Fitness experiences in the Metaverse.

This is a permanent position based in UK or Spain, with the ability to work remotely within those countries only.

What you’ll do 👀

  • You’ll be specifying and implementing backend and gameplay microservices for a dynamic world-class VR experience.

  • You’ll play a part in development planning, including identifying technical risks/issues and coming up with solutions to overcome them

  • Within your team you’ll also investigate technical issues impacting game development and live services, write and maintain software system documentation, and participate in code reviews.

  • As a member of our Engineering community, you’ll actively participate in efforts to improve service quality as well as development productivity.

  • You’ll work closely with your cross-functional team to implement the goals of the company end-to-end and disrupt fitness in the metaverse.

  • As a Senior Engineer, you’ll play a part in the hiring, mentoring and development of other team members.

Tech Stack 💻

  • C# .NET

  • WebAPI

  • React

  • AWS Cloud Services (S3, DynamoDB, RDS SQS and SNS)

  • Github SCM

  • Docker and Kubernetes

You should apply if ✅

  • You have proven hands-on experience with the above technologies

  • You have experience in designing, developing and maintaining microservices
    • You’ll also need to be comfortable creating and maintaining API Documentation (i.e. Swagger)

  • You’re passionate about upholding and improving development best practices across a team

  • You’re skilled in writing and implementing unit tests, ideally including Test-Driven Development (TDD)

  • You love gaming, and have a deep knowledge of gamification and game services development

  • You bring experience of working with multiplayer games

Our mission is to make fitness fun and accessible for everyone. To build inclusive products, we need to build an inclusive team. Please know that this list is indicative and that we would still love to hear from you even if you feel you only are a 75% match. Skills can be learnt, diversity cannot. We promote a diverse and inclusive culture at FitXR.

Logistics 🛠

Our interview process takes place on Google Hangouts and tends to consist of the following stages:

  • Initial screen

  • Hiring Manager

  • Technical interviews

  • Principles of Play

  • Final Interview

Please let us know if you require any accommodations for the interview process, and we’ll do our best to provide assistance.


🌎 Fully remote: your life, your way of working

🏝 Unlimited annual leave

💰 Competitive salary with half year and end of year reviews

📈 Stock options

🌱 £800 per annum learning budget

🧘 £600 per annum wellbeing budget

🏡 £400 work from home budget

🤗 Annual company retreat & regular get togethers

💻 Quest 2 VR headset

⛑ Private Health Insurance (optional)

🚴‍♂️ Annual travel pass & cycle to work scheme

👶 12 weeks full paid family leave

Company benefits

Open to part-time employees
Open to job sharing
Open to compressed hours
Work from anywhere scheme
Unlimited annual leave
Work from home allowance
Enhanced maternity leave
Enhanced paternity leave
Adoption leave
Fertility treatment leave
Pregnancy loss leave
Carer’s leave
Shared parental leave
Pension match/increase
Share options
Personal development budgets
Skilled worker visas
Employee assistance programme
Company wide holidays/offsites
Teambuilding days
L&D budget
Time off in-lieu
Wellbeing allowance
Mental health days
Enhanced sick pay
Duvet days
Compassionate leave
Co-working space allowance
Stock options
Wellness budget (£600 p/a) to spend on anything relating to health and wellbeing (yoga, weights, gym memberships or online subscriptions)
Learning budget (£800 per annum) to all employees upon starting, powered by Learnerbly you can spend on training courses, reading material and online content.
Private medical cover (UK- Vitality, Spain - Axa and US - Empire Blue)

The FlexScore® is the result of a rigorous 2-step verification of a company’s flexibility

First we assess the flexibility options FitXR provides and then we anonymously survey a statistically significant proportion of their employees to make sure FitXR is as flexible as they say they are. Our assessment is based on the six key elements of flexibility: location, hours, autonomy, benefits, role modelling and work-life balance.

We ask the hard questions so you don’t have to.

Working at FitXR

Company employees


Gender diversity (male:female:non-binary)


Office locations


Funding levels

Awards & Achievements
Most flexible AI & VR companies – 2nd

Most flexible AI & VR companies – 2nd

Industry awards 2022