Backend Developer

About Freeletics

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

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

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

Your Responsibilities

• Build and scale backend services powering AI-driven workouts for millions of users
• Architect and optimize backend systems for performance, scalability, and reliability
• Identify bottlenecks, propose improvements, and implement caching strategies
• Develop APIs and integrations for mobile and web applications
• Collaborate with teams across UA, CRM, marketing, and data to align backend development with business goals
• Write clean, maintainable, well-tested code and follow engineering best practices
• Improve observability and monitoring to ensure backend system health and uptime
• Contribute to DevOps tasks, including CI/CD pipelines, Kubernetes, Docker, and AWS
• Mentor fellow engineers via code reviews, technical guidance, and knowledge sharing

Your Profile

• Experience designing and implementing RESTful APIs for high-traffic applications
• Strong development experience with Ruby and the Rails framework (or similar)
• Familiarity with event-driven architecture
• Strong communication skills; comfortable in an agile, cross-functional team
• Proficiency with GitHub and collaborative development tools
• Experience with testing frameworks such as RSpec
• Knowledge of cloud services (ideally AWS) and infrastructure-as-code tools
• Hands-on experience with CI/CD tools and pipelines
• Passionate about system performance, clean code, and continuous improvement
• Team player with a collaborative mindset and a willingness to share knowledge

Your Benefits

• Competitive Rewards: Attractive salary and pension plan, with regular reviews
• Flexible Work Culture: 4-day work week, hybrid and flexible hours
• Wellness & Perks: Freeletics memberships, mental health support, bike leasing, language courses, and public transport subsidies
• Personal Growth: Career development aligned with your personal goals
• Modern Workspace: Rooftop terrace, stocked kitchen, showers, laundry, and more in our brand-new office
• Community & Engagement: Regular team events, offsites, and outdoor activities
• Tech of Your Choice: Latest MacBook or laptop via our device lifecycle program
• Time Off: 27 vacation days plus 15 public holidays
• Innovation Sprints: Participate in regular hackathons across departments

Ready to Join Freeletics?

If you’re excited about helping people become stronger versions of themselves through data-driven fitness innovation, we’d love to hear from you.

See life at Freeletics for yourself here.