Build and maintain core customer journeys such as login, account management, billing & payments, and self-service features
Develop with Next.js / React and TypeScript using a component-driven approach
Design web experiences that work seamlessly on both desktop and mobile devices
Collaborate on mobile app experiences in React Native and ensure a consistent UX across all channels
Integrate frontend applications with API-driven backends (GraphQL / REST)
Apply schema-based typing and validation (e.g., Zod) for reliable data handling and consistent interfaces between frontend and backend
Work closely with UX/UI design, backend, QA, and platform teams in Agile/Scrum setups
Ensure performance, accessibility, and quality across browsers and devices
Contribute to frontend standards, testing strategies, and CI/CD quality processes
Use AI agents for autonomous code generation and focus on strategic reviewing, architecture, and efficient human-in-the-loop processes
Requirements
Several years of experience building production-ready frontend applications with React / Next.js and TypeScript
Strong frontend fundamentals: component architecture, performance optimization, accessibility, and modern CSS
AI-native developer mindset: proficient with agent-driven workflows using tools like Claude Code, Cursor (Composer), or Windsurf (Cascade)
Experience with API-first platforms and authentication flows
Pragmatic approach to testing and secure working practices in CI/CD-driven teams
Strong communication skills in German and English and a pronounced ownership mindset
Nice to have: experience with GraphQL, experience developing configurable or white-label products, familiarity with Mobile-First strategies (PWA) and/or cross-platform approaches (Flutter, React Native), or willingness to learn
Tech Stack
Flutter
GraphQL
JavaScript
Next.js
React
React Native
TypeScript
Benefits
A highly motivated team with flat hierarchies and short communication paths
An office in the heart of Cologne and the option for hybrid work
Lots of fun at work and within the team
Competitive compensation and 30 days of vacation per year
Subsidy for the job ticket (public transport pass) and free parking spaces