Senior Fullstack Engineer; m​/f​/d

Position: Senior Fullstack Engineer (m/f/d)
Location: Germany

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 teams in Berlin.

* 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 Type Script, React, and are comfortable solving complex UI challenges

* State & API Management:
You are experienced in integrating APIs and managing application state using Tan Stack 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 & Dev Ops:
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 goal for your first 6 months

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

* Ecosystem Integration:
You become familiar with the EGYM ecosystem and the roles of various teams within the software engineering department

* Codebase Proficiency:
You contribute effectively and confidently to our shared codebase

The equipment we provide

* Modern Tech Stack & AI Evolution:
We don't just maintain; we evolve. Explore our Tech Radar to see our stack, and join us in building an AI-agentic, iterative, and incremental product culture where AI is a core accelerator of our development lifecycle

* Learning time:
Use 10% of your time on learning topics of your choice (conferences, hackathons, internal and external events, videos, books or innovation projects)

* Continuous Development:
Develop your skills with varied, challenging tasks and regular feedback to benefit from a steep learning curve

* Dynamic & International:
Be part of a motivated, ambitious and international team that uses English as a working language - get some team insights

* Work-Life-Balance:
Enjoy a hybrid workplace model, lots of flexibility and 30 days of vacation

* Fit & healthy:
Train for free with EGYM Wellpass in several thousand sports and health facilities across Germany and/or use our in-house gym with EGYM products

* Flex Budget:
Use €60 per month flexibly for public…