Senior Frontend Developer (React / Next.js, and German language)

In this role, you will shape the user experience of a modern web application that gives engineers and planners at a German transmission system operator clear, fast access to technical asset information. You will own the interface of a data-heavy product, from importing and validating structured data to filtering and visualizing it, working side by side with backend and content platform specialists., * Develop the application frontend with React, Next.js, and TypeScript, creating fast, accessible interfaces for data-heavy workflows

• Build and maintain the backend-for-frontend layer with Nest.js, serving the UI through REST and GraphQL APIs
• Integrate the application with Sitecore XM Cloud or a comparable headless CMS to deliver managed content reliably
• Implement bulk import and export of structured data (for example from Excel), including validation, filtering, and visualisation
• Structure the UI as microfrontends, using Tailwind CSS and Radix UI components to keep it consistent and easy to extend
• Collaborate closely with designers, backend engineers, and client stakeholders to turn business needs into usable features
• Set up and maintain CI/CD pipelines in Azure DevOps and deploy to Microsoft Azure
• Contribute to code reviews and share frontend best practices within the team

• 5+ years of professional frontend development experience
• 3+ years of hands-on experience with React, Next.js, and TypeScript
• 1+ year of experience with headless CMS platforms, preferably Sitecore XM Cloud or comparable
• Proven experience with microfrontend architectures and with backend-for-frontend implementations using Nest.js
• 3+ years of experience working with REST and GraphQL APIs
• Solid knowledge of HTML and CSS in modern web applications, including Tailwind CSS and UI component libraries such as Radix UI or comparable
• Experience developing data-intensive web applications, including bulk data processing
• Practical experience with Microsoft Azure and Azure DevOps, including CI/CD pipelines
• Experience with monorepo-based development environments
• Scalable frontend architectures in enterprise environments
• Frontend performance optimization
• Fluent German (C1) and very good English for working with the client, joining technical discussions, and writing documentation