Fullstack Engineer

Berlin, DE | Germany (REMOTE) | Stuttgart, DE

We are now looking for a Fullstack Developer (Frontend / API) who combines modern web development with strong system thinking—building performant, user-centered applications across frontend and backend layers.

• Flexible working hours and 100% overtime compensation
• Work where it works for you. At home or in the office, or any mix you like
• Working for strong brands and clients we believe in
• 30 days vacation per year
• Company Benefits
• Urban Sports Club
• Nice people in welcoming teams

• Build modern, high-performance web interfaces for complex applications
• Translate UX/UI concepts into scalable frontend architectures
• Design interfaces that make complex AI and agent-driven systems intuitive and usable
• Ensure consistent, responsive, and high-quality user experiences across devices
• Contribute to RFPs, pitches, and interactive prototypes
• Develop and integrate APIs for data- and AI-driven applications
• Integrate agentic workflows and orchestration layers into usable application logic
• Work with structured data models, authentication, and interface logic

• Act as the interface layer between users and agentic systems—making multi-agent workflows accessible and controllable
• Collaborate closely with Product, Design, AI Engineers, and Solution Architects
• Design modular components and reusable system patterns
• Bring structure to technical decisions and reduce system complexity

• Several years of experience building modern web applications (frontend + API)
• Experience designing and integrating REST or GraphQL APIs
• Experience with AI/GenAI integrations (e.g. OpenAI, Gemini APIs)
• Solid understanding of state management, performance, accessibility, and responsive design
• Experience with backend technologies (e.g. Node.js, Express, FastAPI)
• Familiarity with design systems and component libraries (e.g. Storybook, Tailwind, shadcn/ui)
• Understanding of cloud-based architectures and deployment processes
• Experience working in interdisciplinary teams

• Experience with real-time technologies (Web Sockets, streaming)
• Experience with CI/CD, Docker, or platforms like Cloud Run, Vercel, or Kubernetes
• Experience with headless CMS, DAM, or Mar Tech systems
• Passion for building clean, scalable, and understandable frontend architectures

You’ll connect user experience and system logic—building interfaces and APIs that turn complex AI capabilities into usable, high-performing applications. Your work enables teams to deliver seamless, end-to-end digital products that scale across platforms and use cases. By structuring frontend and backend as modular, reusable systems, you help reduce complexity, accelerate development, and ensure consistency across experiences—turning ideas into reliable, real-world applications.

We care about your personality and professional skills. We don't care about your gender, age, nationality or appearance and are open to working with everyone.