Senior Frontend Developer (React/TypeScript)

Testo SE & Co. KGaA

Job Description
Join us in transforming how Testo's smart measuring instruments connect and interact with our digital ecosystem. Our goal: to build
intuitive, high-performance and accessible software that integrates seamlessly with our devices and empowers users to work smarter.
Your Role in Our Team
  • Drive the development and evolution of modern web applications using TypeScript, ReactJS and the latest technologies.
  • Transform design concepts into polished, performant and accessible user interfaces in collaboration with UX/UI experts.
  • Take full ownership of frontend components in a cross-functional, Agile team.
  • Write high-quality, testable, scalable and maintainable code that follows industry best practices.
  • Lead by example in code reviews and help uphold our high engineering standards.
  • Play an active role in Agile ceremonies such as sprint planning, stand-ups, and retrospectives.
  • Live a DevOps culture: 'You build it, you run it' — from development through to deployment and monitoring.
  • Mentor junior developers and foster a culture of continuous learning and growth.
  • Continuously refine our tooling and processes to boost team productivity and code quality.
  • Contribute to architectural decisions and ensure the scalability of our frontend systems.

  • Strong teamwork and collaboration skills, including experience with Pair Programming and working effectively in Agile, cross-functional teams.
  • 5+ years of hands-on frontend experience with a strong emphasis on React.
  • Advanced proficiency in JavaScript, HTML, CSS and TypeScript.
  • Deep understanding of React's core concepts and advanced state management techniques (e.g., Redux).
  • Practical experience with ESLint, Jest/Vitest and RESTful API integrations.
  • Awareness of modern frontend trends, tooling and performance optimization techniques.
  • Experience with frontend testing frameworks and CI/CD pipelines.
  • Exposure to micro frontends or modular frontend architectures is a plus.
  • A sharp eye for detail, excellent problem-solving ability, and a passion for clean, maintainable code.
  • Fluent English skills; German skills are a plus.

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