> Markdown version of [/jobs/ext/375375-senior-frontend-developer](https://www.wearedevelopers.com/jobs/ext/375375-senior-frontend-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Frontend Developer - **Company:** Semalytix GmbH - **Location:** Bielefeld, Germany (Remote available) - **Experience:** Expert - **Salary:** €60,000.0 - €80,000.0 - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Agile Methodology, HTML5, Browser Compatibility, Cascading Style Sheets (CSS), Software Quality, Code Review, Continuous Integration, Data Architecture, Relational Databases, Software Design Patterns, Programming Tools, Text Processing, Python (Programming Language), PostgreSQL, Open Web Application Security, Performance Tuning, Strategies of Testing, TypeScript, Web Applications, Web Platforms, Tailwind, ReactJS, Cypress (Programming Language), Backend, Git, Fastapi, Webpack, Material UI, Playwright, Graphql, Front End Software Development, React Testing Library, JestJS, Restful APIs, Software Version Control - **Published:** June 4, 2026 - **Apply:** https://de.indeed.com/viewjob?jk=ebb0eb75f8ca4dc6 ## About the Role * At least 4 years of experience building modern web applications, with a strong focus on React and its ecosystem (e.g., TanStack Query, React Router). * Solid skills in JavaScript and TypeScript, plus a good understanding of HTML5 and CSS3 (including utility-first frameworks such as Tailwind and component-level styling approaches). * Experience with headless component libraries (e.g., Radix UI / shadcn) and rich-text editors (e.g., TipTap / ProseMirror) is a plus. * Experience integrating frontends with RESTful or GraphQL APIs; comfort working against a non-JavaScript backend is a plus. * Working knowledge of relational databases (Postgres in particular) and how frontend needs shape API and data design. * Familiarity with version control (Git), CI/CD workflows, and modern build tooling (e.g., Vite, Webpack, or similar) as well as security best practises following OWASP Top 10 for web applications and similar. * Experience with testing frameworks and tools (e.g., Vitest or Jest, React Testing Library, Playwright/Cypress) is a plus. * First-hand experience or strong interest in using GenAI-assisted development tools (e.g., Claude Code, Lovable) and a willingness to experiment responsibly with them. * Strong grasp of performance optimization and scalable frontend architecture. * Experience with agile methodologies. * B2 level English language skills (German is a plus). ## Description * Design, implement, and maintain user-facing features in React for our internal and customer-facing web applications. * Build and evolve reusable component libraries and design patterns for a consistent user experience. * Integrate frontends with our Python/FastAPI APIs and Postgres-backed services. * Assess integrations and expand their scope to avoid OWASP Top 10 and other common security flaws. * Collaborate with product managers, designers, and backend engineers to deliver end-to-end features. * Use GenAI-assisted tooling (e.g., Claude Code, Lovable) in a thoughtful way to speed up prototyping, refactoring, and boilerplate-heavy tasks. * Ensure performance, accessibility, responsiveness, and cross-browser compatibility of our applications. * Contribute to and improve our frontend architecture, testing strategy, and code quality standards. * Participate in code reviews and knowledge sharing to keep the team aligned and the codebase healthy. * Stay up to date with modern frontend, React, and web platform best practices. ## Related Videos - [To New Frontiers: The Future of Frontend Development](https://www.wearedevelopers.com/videos/404-to-new-frontiers-the-future-of-frontend-development) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [Git for Code Reviews](https://www.wearedevelopers.com/videos/429-git-for-code-reviews) - [Can SVG be fast? 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