At a Glance
- Tasks: Design and implement ML features for a cutting-edge fitness platform.
- Company: Join ROXFIT, a pioneering hybrid fitness tech company.
- Benefits: Competitive salary, equity options, and hybrid working model.
- Other info: Be part of a fast-growing team with high ownership and autonomy.
- Why this job: Make a real impact on fitness transformation using AI and ML.
- Qualifications: 2-6+ years in AI/ML with experience in real-world data.
The predicted salary is between 75000 - 95000 £ per year.
Join to apply for the AI/ML Engineer role at ROXFIT. ROXFIT is building the ultimate hybrid fitness platform – combining in‑person training, tracking, habit systems, community and next‑generation product design into one seamless experience. Our vision is to create a platform that genuinely helps people stay accountable, build lasting habits and achieve meaningful transformation. We blend technology, psychology, and world‑class coaching into a single integrated experience.
We’ve recently launched V2 and are moving fast. Things are breaking, evolving and improving constantly. We need someone who wants to help us build a category‑defining product from the ground up. We’re at a pivotal growth moment and looking for an AI/ML Engineer who can turn athlete data into practical, production‑ready intelligence across the product. This role is for someone who enjoys shipping real ML systems in fast‑moving environments and owning their impact on training, performance and progression.
What You Will Do
- Design and implement ML‑driven features across training, performance insights and progression
- Work with athlete, workout and race data to build intelligent systems
- Develop and iterate on models that support personalisation and recommendations
- Collaborate with backend engineers to productionise ML systems
- Own the end‑to‑end lifecycle from experimentation to deployment
- Balance speed, accuracy and practicality in a fast‑moving product environment
- Help shape how AI is used responsibly and effectively across the platform
This is a hands‑on role with real ownership and direct product impact.
What We Are Looking For
- AI/ML Engineer with 2–6+ years experience
- Comfortable working across data, models and production systems
- Pragmatic – focused on shipping value, not just building models
- Confident working with messy, real‑world data
- Used to collaborating closely with product and engineering
- Have experience with recommender systems, time‑series data or behavioural data
- Have worked on fitness, health or performance‑related products
- Enjoy translating complex outputs into simple product insights
- Have an interest in training, endurance or hybrid fitness (HYROX context is a plus)
About You
- Loves building rather than watching from the sidelines
- Can work quickly without sacrificing detail
- Thrives in small teams where ownership is huge
- Wants to be a foundational part of a product that is scaling fast
- Is willing to push when the team needs it and enjoys the challenge
What We Offer
- High ownership and autonomy
- Direct collaboration with founders and engineering leadership
- Work on a category‑defining product in hybrid fitness
- Hybrid working from our Battersea HQ
How to Apply
- Step 1 – Head to: https://forms.roxfit.app/jobs-dec-25 Fill out the form and upload a short video and any documents. All information is on the form.
- Step 2 – Online Chat If shortlisted, you’ll join a video call with Ben (Co‑Founder & CEO). Come down to the office and meet the leadership team.
- Step 4 – Decision We like to run a lean process and this is all we need to make a decision.
Seniority level: Mid‑Senior level
Employment type: Full‑time
Job function: Engineering and Information Technology
Industries: Wellness and Fitness Services
AI/ML Engineer employer: ROXFIT
ROXFIT is an exceptional employer for AI/ML Engineers, offering a dynamic work environment where innovation meets fitness technology. With a strong focus on employee autonomy and direct collaboration with leadership, team members have the opportunity to make a significant impact on a category-defining product while enjoying the flexibility of hybrid working from our Battersea HQ. The culture fosters growth and encourages individuals to take ownership of their projects, making it an ideal place for those passionate about transforming the fitness industry through cutting-edge AI solutions.
StudySmarter Expert Advice🤫
We think this is how you could land AI/ML Engineer
✨Tip Number 1
Get your hands on that video application! A short, engaging video can really showcase your personality and passion for AI/ML. Make sure to highlight your experience and how you can contribute to ROXFIT's vision.
✨Tip Number 2
Prepare for the online chat with Ben by brushing up on your knowledge of fitness tech and AI applications. Show him you’re not just about the code but also understand the impact of your work on real athletes.
✨Tip Number 3
Don’t underestimate the power of networking! Reach out to current or former employees on LinkedIn to get insights about the company culture and what they value in a candidate. It could give you an edge!
✨Tip Number 4
Finally, be ready to discuss your past projects in detail. Be specific about how you’ve tackled messy data and built ML systems that deliver real value. This is your chance to shine and show you’re the right fit for ROXFIT!
We think you need these skills to ace AI/ML Engineer
Some tips for your application 🫡
Show Your Passion:When you're writing your application, let your enthusiasm for AI and fitness shine through! We want to see that you’re not just ticking boxes but genuinely excited about the role and what we’re building at ROXFIT.
Tailor Your Experience:Make sure to highlight your relevant experience in AI/ML, especially any work with messy real-world data or recommender systems. We love seeing how your background aligns with our needs, so don’t hold back!
Be Clear and Concise:Keep your application straightforward and to the point. We appreciate clarity, so avoid jargon and focus on how your skills can directly impact our product. Remember, we’re looking for practical solutions!
Follow the Application Steps:Don’t forget to apply through our website! Fill out the form, upload your video, and any documents as instructed. Following our process shows you can pay attention to detail, which is super important for this role.
How to prepare for a job interview at ROXFIT
✨Know Your Stuff
Make sure you brush up on your AI and ML concepts, especially those related to recommender systems and time-series data. Be ready to discuss how you've applied these in real-world scenarios, particularly in fitness or performance contexts.
✨Show Your Passion
ROXFIT is all about building a product that helps people transform their fitness journeys. Share your personal experiences with fitness and how they inspire your work in AI/ML. This will show them you're not just technically skilled but also genuinely invested in the mission.
✨Prepare for Collaboration
Since this role involves working closely with backend engineers and product teams, think of examples where you've successfully collaborated in the past. Highlight your communication skills and how you can bridge the gap between technical and non-technical team members.
✨Emphasise Ownership
ROXFIT values individuals who take ownership of their work. Be prepared to discuss projects where you’ve taken the lead, from experimentation to deployment. Show them you’re someone who thrives in fast-paced environments and is ready to make an impact.
