Fullstack Engineer

WONGDOODY

Fullstack Engineer developing performant, user-centered applications for WongDoody, focusing on web development with frontend and backend technologies.

Posted 5/11/2026full-timeBerlin • 🇩🇪 GermanyMid-LevelSeniorWebsite

Tech Stack

Tools & technologies

CloudGraphQLJavaScriptNext.jsNode.jsReactTypeScriptVue.js

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

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/or English (B2–C1)
Work permit for Germany and at least one year of work onsite in Germany

Benefits

Comp & perks

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

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

TypeScriptJavaScriptReactNext.jsVueREST APIsGraphQL APIsNode.jsExpressFastAPI

Soft Skills

collaborationcommunicationproblem-solvingtechnical decision-making