React.js Developer Salary: £50,000 – £80,000 (depending on experience) Location: London Working Pattern: Hybrid (4 days on-site, 1 day remote) About the Company Our client is a London-based technology company focused on improving workplace and urban safety using advanced AI, Computer Vision, and Industrial IoT solutions. Their platform enhances existing camera and sensor infrastructure to proactively identify safety risks in real time. The technology is used across industries including manufacturing, construction, energy, healthcare, and smart city environments. The company helps organisations reduce workplace incidents, maintain health and safety compliance, and gain operational insights. Strong emphasis is placed on data privacy, ethical AI, and scalable enterprise-grade systems, while maintaining a user-friendly experience. About the Role We are seeking a React.js Developer to join a growing front-end engineering team. You will work on complex, data-driven user interfaces used in safety-critical applications and collaborate closely with back-end engineers and designers. Working closely with back-end engineers and designers, you’ll contribute to performance optimisation, maintain clean and well-documented code, and help shape the overall front-end architecture Key Responsibilities Develop new user-facing features using React.js Build reusable components and front-end libraries Translate designs and wireframes into high-quality, maintainable code Optimise components for performance across devices and browsers Collaborate with back-end developers and designers to improve usability Write clean JavaScript following modern React.js workflows Troubleshoot UI issues and debug application code Ensure technical feasibility of UI/UX designs Keep up to date with emerging front-end technologies and best practices Required Skills & Experience Strong proficiency in JavaScript, including DOM manipulation and object-oriented concepts Solid understanding of React.js and its core principles Experience with common React workflows (e.g. Redux or similar) Familiarity with modern ECMAScript standards Experience working with RESTful APIs Knowledge of modern authentication methods (e.g. JWT) Experience with front-end build tools such as Babel, Webpack, and NPM Strong understanding of performance optimisation techniques Familiarity with Git or similar version control systems Ability to translate business requirements into technical solutions Nice to Have Experience with TypeScript Familiarity with server-side rendering Knowledge of testing frameworks such as Jest or Mocha Experience with CI/CD pipelines What’s on Offer High level of autonomy with trust-based engineering culture Supportive leadership with a focus on quality, ownership, and professional growth Opportunity to work on impactful, real-world applications at scale Collaborative, internationally distributed engineering team Competitive salary and benefits package Clear opportunities for learning, progression, and skill development