Dunnhumby is the global leader in Customer Data Science, partnering with the world’s most ambitious retailers and brands to put the customer at the heart of every decision. We combine deep insight, advanced technology, and close collaboration to help our clients grow, innovate, and deliver measurable value for their customers. dunnhumby employs nearly 2,500 experts in offices throughout Europe, Asia, Africa, and the Americas working for transformative, iconic brands such as Tesco, Coca-Cola, Nestlé, Unilever and Metro. Most companies try to meet expectations, dunnhumby exists to defy them. Using big data, deep expertise and AI-driven platforms to decode the 21 st century human experience – then redefine it in meaningful and surprising ways that put customers first. Across digital, mobile and retail. For brands like Tesco, Coca-Cola, Procter & Gamble and PepsiCo. We’re looking for a Senior Engineer to join our team and help build and evolve the company’s design system. This role focuses on developing high-quality, reusable React components and supporting the infrastructure required to build, test, and release them. Key Responsibilities Conduct requirements analysis for new components and enhancements. Develop new react components, and maintain our existing components. Provide advice and guidance to junior colleagues as required to resolve specific challenges they're having and conduct design and code reviews. Work with consumers to support integration, and investigate and address any issues. Pass on knowledge through documentation and presentations to prevent key person dependencies. Identify and advise on improvement opportunities and automate and simplify, test, and operations processes. Essential Skills(Must Have) React.js TypeScript/JavaScript CSS HTML Desirable Skills(Good to have) React Testing Library Vite Playwright Jira Gitlab Desirable Experience Building and maintaining design systems or UI component libraries Practical experience with accessibility (WCAG 2.2 AA) and cross browser/device/platform UI development Working in Agile environments Development of components based on Figma designs What you can expect from us We won’t just meet your expectations. We’ll defy them. So you’ll enjoy the comprehensive rewards package you’d expect from a leading technology company. But also, a degree of personal flexibility you might not expect. Plus, thoughtful perks, like flexible working hours and your birthday off. You’ll also benefit from an investment in cutting-edge technology that reflects our global ambition. But with a nimble, small-business feel that gives you the freedom to play, experiment and learn. And we don’t just talk about diversity and inclusion. We live it every day – with thriving networks including dh Gender Equality Network, dh Proud, dh Family, dh One, dh Enabled and dh Thrive as the living proof. We want everyone to have the opportunity to shine and perform at your best throughout our recruitment process. Please let us know how we can make this process work best for you. Our approach to Flexible Working At dunnhumby, we value and respect difference and are committed to building an inclusive culture by creating an environment where you can balance a successful career with your commitments and interests outside of work. We believe that you will do your best at work if you have a work / life balance. Some roles lend themselves to flexible options more than others, so if this is important to you please raise this with your recruiter, as we are open to discussing agile working opportunities during the hiring process. For further information about how we collect and use your personal information please see our Privacy Notice which can be found (here)