Senior Frontend Engineer - React.JS (Germany, f/m/d)

Senior Frontend Engineer (React)

We are looking for a highly-skilled Senior Frontend Engineer to join one of our development teams. In this role you will develop and implement UI components using React.js, TypeScript, GraphQL, Jest, Cypress and Vite, build the future of AI‑powered digital advertising, test and profile front‑end performance, document the codebase, mentor teammates, estimate workloads, and contribute to a high‑impact, AI‑first cross‑disciplinary product.

Responsibilities

• Meet with the development team to discuss user interface ideas and applications
• Review application requirements and interface designs
• Identify and design web‑based user interactions
• Develop and implement highly responsive UI components using React concepts
• Write application interface code using TypeScript following React.js workflows
• Troubleshoot interface software and debug application codes
• Develop and implement front‑end architecture to support UI concepts
• Provide automated unit, end‑to‑end, and visual regression tests
• Monitor and improve front‑end performance
• Document application changes and develop updates
• Participate in code and technical design reviews
• Write and review tasks, estimate workloads for yourself and others
• Provide mentorship to team‑members

Profile

• 6+ years of professional experience in a similar position
• Proven expert knowledge of TypeScript, JavaScript, CSS, HTML and front‑end languages
• Quality‑focused mindset and deep passion for user experience and user interfaces
• AI‑first mindset, embedding AI and automation into product architecture, engineering workflows, and decision‑making processes
• Great knowledge of common front‑end tools including React.js, Vite, Jest and Cypress.js
• Great experience with browser‑based debugging and performance testing software
• Excellent familiarity with Git, npm, Docker and Jira
• Great troubleshooting skills
• Good project management skills
• Extensive experience mentoring teammates in a respectful, empathic manner

Benefits

• Transparent, above‑market salaries
• 100% remote within Europe
• Clear expectations and regular feedback
• Flexible work‑hours
• Be part of a fast‑growing, highly-skilled team
• In‑person department and company events
• Home office, co‑working space and work‑together allowance
• Personal and professional development fund

Why Us? Factor Eleven’s tech department is an in‑house tech start‑up/scale‑up responsible for our SaaS product suite offering localized digital advertising to enterprises of all sizes. We power the engine of Factor Eleven, continuously uplift platform quality, and expand capabilities across the engineering and product organization. Join our amazing team in our mission to move digital localized advertising forward and enjoy the freedom, camaraderie and perks of our fully remote operations.

Job Details

Seniority level: Mid‑Senior
Employment type: Full‑time
Industries: IT Services and IT Consulting