Fullstack Developer (Frontend / API)

About the Role We are 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. You’ll work within WongDoody's cross-unit AI, tech and experience team to translate UX/UI concepts into scalable frontend architectures and integrate AI-enabled workflows into robust APIs.

What You'll Do

• Frontend & Experience Development: 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.
• API & Backend Integration: 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.
• System Thinking & Collaboration: 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.

What We're Looking For

• Several years of experience building modern web applications (frontend + API)
• Strong proficiency in TypeScript/JavaScript and frameworks like React, Next.js, or Vue
• 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
• Fluency in German and English (C1)
• Work permit for Germany and at least one year of work onsite in Germany

Nice to Have

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

Compensation & Benefits

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