(Senior) Backend Engineer (all genders)

About Us

Our vision at Freeletics is to show the world that with the right tools, mindset, and coaching, anybody can build a consistent, lifelong fitness habit and actually enjoy it. That’s why we build holistic digital health and fitness products that help people develop a strong, healthy lifestyle. For life. By combining AI technology, sports science, and motivational tools, we’ve created Europe’s #1 fitness app and a truly unique movement in the health and fitness space - with a passionate community and over 56 million users worldwide.

Job Overview

As a Backend Engineer at Freeletics, you’ll be a key part of our infrastructure crew, collaborating closely with a DevOps engineer. You will contribute to a lean engineering team that values agile workflows, autonomy, and constant knowledge-sharing.

This role goes beyond traditional backend development and includes close collaboration with DevOps, infrastructure, Mobile, and Web.

Your Responsibilities

• Run self-organized backend initiatives: You don't wait for tickets. You identify problems, propose solutions, and drive them to completion, always ensuring the topics you bring up directly support the product roadmap and business goals.
• Act as a DevOps sparring partner: You work closely with our DevOps engineer to keep the infrastructure clean and aligned. You collaborate to avoid drift, tech debt, and architectural inconsistency.
• Be thorough, but avoid overthinking: You understand problems deeply before thinking of solutions. You are highly thorough in your approach, but you don't get stuck in analysis paralysis. You ask questions, challenge assumptions, and then you ship.
• Champion architectural pragmatism: You prioritize maintainable, elegant solutions over unnecessary complexity. You know how to design for scale without falling into the trap of over-engineering or building for problems we don't yet have.
• Build for 24/7 reliability: You operate with a zero-downtime mindset. You know how to leverage modern tooling to build and operate high-availability services 24/7—without actually needing to be present 24/7.
• Communicate proactively: You share context early, flag blockers before they escalte, and seek feedback instead of working in isolation. This is a hard requirement, not a nice-to-have.
• Embrace a T-shaped growth mindset: You are eager to learn new things and expand your impact. You have an interest in growing into a T-shaped fullstack engineer, which includes a natural curiosity for mobile development (no prior experience required).

Your Profile

• Experience with Ruby on Rails (or a comparable backend framework)
• Experience designing, documenting, and implementing secure and scalable RESTful APIs.
• High proficiency in writing testable code and achieving comprehensive unit and integration test coverage.
• Experience operating and debugging large-scale server applications with a focus on high throughput and low latency.
• Hands‑on experience with Kubernetes + Flux (or similar GitOps solutions)
• Working knowledge of AWS (networking, compute, storage, IAM)
• Proficiency in database management (PostgreSQL/Aurora, indexing, query optimization, migrations)
• Experience designing and configuring horizontal autoscaling
• Familiarity with Grafana for monitoring/alerting and Elastic APM (or a similar APM solution)
• Experience managing CI/CD pipelines (e.g. GitHub Actions)
• Knowledge of infrastructure tooling like Terraform, Kustomize, and Helm

Your Benefits

• Competitive Rewards: Attractive salary and pension scheme, with frequent reviews to ensure your hard work is rewarded.
• Flexible Working 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, 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 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.).