Senior Backend Developer (all genders)

At Freeletics, we challenge and inspire people worldwide to become the strongest version of themselves—both physically and mentally. With over 56 million users, we’re revolutionizing fitness through AI-powered coaching, sports science, and long-term behavior change. Our personalized training plans and educational audio courses empower our community to build resilience, strength, and discipline. 🚀

To continue disrupting the health & fitness industry, we rely on a scalable, high-performance backend that serves millions of users worldwide. That’s where you come in.

We’re looking for a Senior Backend Developer who thrives in solving complex engineering challenges, improving performance at scale, and driving backend excellence. You’ll work at the intersection of technology, product, and data, helping us shape the future of data-driven fitness innovation.

*Please note that Freeletics will not provide relocation benefits for this role.*

• Build & scale backend services that power AI-driven workouts for millions of users
• Architect, optimise, and refine backend systems to ensure high performance, scalability, and reliability
• Identify and resolve performance bottlenecks, propose improvements, and implement caching strategies
• Develop APIs and integrations that power our mobile and web applications
• Collaborate with cross-functional teams (UA, CRM, marketing, data) to align backend solutions with business goals
• Write clean, maintainable, and well-tested code while following best practices
• Improve observability & monitoring to ensure system health and uptime
• Contribute to DevOps processes, including CI/CD pipelines, Kubernetes, Docker, and AWS infrastructure
• Mentor and support other engineers through code reviews, knowledge sharing, and technical guidance

• Experience designing RESTful for high-traffic applications
• Experience in developing applications using Ruby, and Rails framework or similar frameworks
• Exposure to event-driven architectures
• Very good communication skills and comfortable working in an agile, cross-functional, and autonomous team environment
• Experienced using Github as a collaboration tool with an engineering team
• Experience in testing methodologies, e.g. RSpec or any other approach
• Exposure to cloud services (ideally AWS), and infrastructure as code tool
• Hands-on approach with CI/CD
• Passion for clean code, system performance, and continuous improvement
• Team player, strong collaborator and happy sharing knowledge with the engineering team

• Competitive Rewards: Attractive salary and pension scheme, with frequent reviews to ensure your hard work is rewarded.
• Flexible Work Culture: Experience the freedom of a 4-day work week, hybrid setups, and adjustable hours to balance your life and work seamlessly.
• Wellness & Perks: Enjoy comprehensive benefits including memberships with Freeletics, mental health resources, bike leasing, public transport subsidies, language learning opportunities, and more.
• Personal Growth: Design your own career trajectory, supported by a company that values your personal and professional aspirations.
• Modern Workspace: Thrive in a brand-new office equipped with a rooftop terrace offering stunning mountain views, a fully-stocked healthy kitchen, cutting-edge meeting rooms, versatile training areas, showers, and laundry facilities.
• Community & Engagement: Connect and grow through regular team events—hiking, holiday gatherings, offsites, and more.
• Tech of Your Choice: Work with the latest MacBook or laptop within our lifecycle program to keep you equipped and efficient.
• Time Off: Recharge with 27 vacation days plus 15 public holidays.
• Innovation Sprints: Participate in hackathons, encouraging both tech and non-tech teams to innovate.

See life at Freeletics for yourself here . Interested?

To all recruitment agencies and headhunters: Freeletics does not accept speculative or unsolicited CVs from agencies and headhunters. Any unsolicited CVs received will be treated as the property of Freeletics and Terms & Conditions from agencies or headhunters associated with the use of such CVs will be considered null and void. Vacancies are not open to any agencies, unless otherwise specified in the description.

Freeletics is an equal opportunity employer, fully committed to fostering an inclusive and respectful work environment where everyone can succeed. A kaleidoscope of cultures, languages and personalities, all are welcome here regardless of background, race, color, creed, sexual orientation, gender expression or athletic ability. We celebrate diversity in its many forms and firmly believe that our strength lies in our differences. In nurturing many perspectives and voices, we are able to collectively power the next generation of digital fitness technology inspiring a healthier, happier, and stronger world.

Should you need adjustments at any point in the application or interview process, just let us know. We are also happy to use your pronouns of choice (for example - she/her/hers, he/him/his, they/them/theirs, etc.).