Senior Software Engineer (Ruby on Rails / Vue.js)
📍 Location: London (Hybrid – 3 days onsite)
💰 Salary: £80,000 – £100,000
🕒 Type: Permanent
The Company
FITR is one of the fastest-growing fitness technology platforms globally, providing software that enables coaches, gyms and fitness brands to build, deliver and scale digital training programmes. Following several years of exceptional growth, the business is expanding its London engineering team to support the next stage of platform evolution.
The Opportunity
This is a senior full-stack engineering role where you’ll take ownership of some of the platform’s most business-critical systems, from payments and subscriptions to scheduling, APIs and cloud infrastructure.
Working closely with the Head of Engineering and Product team, you’ll help shape technical direction while acting as a key engineering partner across a modern SaaS platform. This is a hands-on role with plenty of autonomy, ideal for someone who enjoys owning features from design through to production.
What You’ll Be Doing
- Design and build scalable backend services using Ruby on Rails
- Develop and maintain APIs powering web and mobile applications
- Build full-stack features across Rails and Vue.js
- Own payment and subscription functionality, including Stripe integrations
- Improve application performance, reliability and scalability
- Build background processing and real-time features
- Contribute to AWS infrastructure, CI/CD and deployment pipelines
- Help modernise the platform and drive engineering best practices
- Work closely with Product and Engineering leadership on technical direction
What They’re Looking For
- Strong commercial experience with Ruby on Rails
- Comfortable working across both backend and frontend (Vue.js preferred)
- Experience building scalable SaaS products and REST APIs
- Strong knowledge of PostgreSQL, background processing and cloud platforms
- Experience with AWS, Docker and CI/CD pipelines
- Exposure to payment systems (Stripe preferred) is highly desirable
- Strong testing mindset and experience delivering production-quality software
Why Join?
- Join one of the UK’s fastest-growing fitness technology companies
- High ownership with direct impact on product direction
- Modern engineering culture with plenty of technical autonomy
- Hybrid working from Soho with a collaborative team environment
- Unlimited annual leave, company pension, new MacBook, regular team lunches and a dog-friendly office
