Senior Fullstack Engineer (m/f/d)

About the role

You are a Senior Fullstack Engineer (m/f/d) with in-depth Frontend knowledge driving the end-to-end development of our online services. While your primary focus is delivering high-performance web-based interfaces, you possess the technical depth to navigate our Backend and Mobile ecosystem end-to-end. You’ll maintain architectural oversight across the entire solution, collaborating with team members to engineer holistic technical solutions that translate into global well-being. Are you excited to build interfaces that impact millions of users? Then apply now as Senior Fullstack Engineer (m/f/d) for our team in Berlin.

Your daily workout

- Feature Ownership: You will lead the development of customer-facing features, guiding them from initial concept and UX testing to full implementation

- Operational Excellence: You will facilitate engineering best practices within our monorepo setup and participate in our Communities of Practice to drive platform wellness and technical ownership across the organization

- Technical Leadership: You will provide direction to the team, helping define the technical roadmap, system architecture, and development processes

- AI-Enhanced Workflow: You will leverage AI-assisted coding tools to accelerate development, improve code consistency, and focus on solving high-level architectural challenges

- Frontend Excellence: You will create complex user interfaces with a deep focus on interaction design, clean code and testability using industry best practices

- Cross-Functional Collaboration: You will communicate effectively across teams to unblock challenges and design scalable solutions that work across the entire EGYM ecosystem

Your fitness level

- Frontend Mastery: You have at least 7 years of hands-on experience in frontend development and operating professional web services

- Web Expert: You possess advanced knowledge of TypeScript, React, and are comfortable solving complex UI challenges

- State & API Management: You are experienced in integrating APIs and managing application state using TanStack Query, Jotai, or similar modern state managers

- Backend Literacy: You can comfortably read and reason about backend code in our stack (Java/Go), follow data flows across microservices, understand service boundaries and dependencies, navigate SQL database structures, and diagnose the root cause of issues

- Modern Tooling: You have experience working with design systems and a strong commitment to unit, integration, and end-to-end testing

- CI/CD & DevOps: You have a solid understanding of CI pipelines and the principles of end-to-end continuous delivery

- Bonus Points: You have experience with web-to-native bridges like Ionic, Capacitor, or React Native is a big plus

Your training goals for the first 6 months

- Ownership: You take full ownership of your work, understanding its architecture and delivering on product requirements while improving testability