Hybrid Senior Frontend Engineer, React, Next.js

at E.ON

• Job title: Senior Frontend Engineer, React, Next.js
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Flutter, GraphQL, JavaScript, Next.js, React, React Native, TypeScript
• Location requirements: Hybrid, Koln, Germany

About the role

• Senior Frontend Engineer developing user experiences at E WIE EINFACH in Köln. Responsible for frontend development and enhancing digital platforms using React and Next.js.

Responsibilities

• 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

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