Fullstack Engineer

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

• 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

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.

WongDoody Berlin, DE | Germany (REMOTE) | Stuttgart, DE WongDoody creates human experiences at 24 studios across 4 continents. We believe the future can be molded. And by shaping human experiences through creativity and tech, we work to build a future we believe in. For us, this starts with our own culture. We strive to create an inclusive environment where every human can bring their whole self to work. Our clients are brands we believe in, from global big players to local heroes to startups we love. With each of our partners, we embark on a journey of co-creation, pushing the boundaries of what's possible and exploring the space where creativity and tech meet. Our team of fun, welcoming, values-driven and collaborative problem solvers has one focus at the heart of everything we do: human experience. Human experiences are the touchpoints where brands connect with customers. And we transform businesses by creating engaging, inspiring moments using strategy, creativity, data and technology-all backed by the global technological power of Infosys. Experience, Tech & AI We are a cross-unit and cross-location AI, tech and experience team. With more than 50 developers, AI & Fullstack engineers, UX designers and consultants working directly with other WongDoody teams, we are team players and specialists - oth in frontend and backend. As part of Infosys, we belong to a leading global technology company with access to solutions and extensive know-how in the fields of commerce, marketing automation and AI, among others. 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. Our local 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 * Working for strong brands and clients we believe in * 30 days vacation per year * Company Benefits * Urban Sports Club * Nice people in welcoming teams, Please note: This is a job ad by WongDoody GmbH based in Germany. Through our website or other sources, you may find job ads published by one of our WongDoody sister companies around the globe with whom we act jointly under the band "WongDoody". For each job offer, only the entity is responsible, which has published the ad. Contact persons, required information and applicable terms may differ. You can inform yourself how WongDoody GmbH is processing your personal data provided in the application process here.