Digital Front End Developer - Optimisation

Overview

As a Digital Front-End Developer within our Optimisation team, you'll play a key role in improving the customer experience through hands-on development and experimentation. This is a technically focused role, writing and manipulating production-quality code to deliver A/B tests, performance improvements, and user experience enhancements across our digital platforms. You will work alongside two other optimisation developers to shape how we test, learn, and optimise at pace.

You will spend your time building and modifying experiments within our CRO tooling, occasionally developing features from scratch, and ensuring everything we ship is fast, accessible, and robust. From interpreting briefs and translating requirements into clean code, to running QA, accessibility checks, and performance reviews, you’ll own work end to end. You’ll collaborate closely with non-technical stakeholders across Product, UX, and the wider Digital team, confidently explaining technical decisions and constructively challenging requirements where needed.

This role offers a wide variety and learning opportunity, where no two tickets are the same. Some will be small refinements, others full builds, and you’ll gain exposure to external agencies, senior third-party developers, and specialist optimisation partners.

• Build, modify, and deploy A/B tests using our CRO platform (Webtrends Optimize), working directly with production-quality code
• Manipulate and refactor existing HTML, CSS, JavaScript, jQuery, and React-based components to deliver optimisation activity
• Translate briefs and business requirements into robust, scalable technical solutions, challenging assumptions where needed
• Own the end-to-end delivery of optimisation work, from development through QA, deployment, and post-launch checks
• Perform accessibility testing and audits using tools such as Browser Stack, ensuring compliance with accessibility standards
• Conduct site speed and performance checks, optimising for Core Web Vitals and overall user experience
• Resolve development tickets from across the business using Jira, managing multiple priorities in a fast-paced environment
• Carry out QA testing, peer code reviews, and P2P feedback to maintain high development standards
• Collaborate closely with UX, Product, Digital, and IT teams to ensure work aligns with brand, design, and technical guidelines
• Contribute to continuous improvement through experimentation, knowledge sharing, and extra-curricular development projects

• Proven experience as a hands-on Front-End Developer, CRO Developer, or similar role, working directly with production code
• Strong technical foundation in HTML, CSS, JavaScript, and jQuery, with the ability to confidently manipulate and refactor existing code
• Working knowledge of React and modern JavaScript frameworks, enabling you to understand and adapt component-based front ends
• Experience building or supporting A/B tests using optimisation platforms (Webtrends Optimize experience desirable but not essential)
• Comfortable working with QA, accessibility, and performance testing tools, with a strong attention to detail and quality
• Confident communicator who can work effectively with non-technical stakeholders, clearly explaining technical solutions and constructively pushing back when needed
• Naturally curious and proactive, with a problem-solving mindset and a desire to continuously improve how things are built and delivered
• Able to manage multiple priorities in a fast-paced environment, balancing speed with best practice
• Collaborative team player who enjoys knowledge sharing, peer reviews, and learning from others—both internally and with external agency partners

At Halfords, our mission is to inspire and support a lifetime of motoring and cycling. As a specialist retailer, we lead the market through customer-driven innovation and a distinct product range. We are dedicated to providing our customers with an integrated, unique, and convenient service experience—from e-bike and electric vehicle servicing to on-demand solutions. Our commitment is to foster customer loyalty by offering compelling reasons to keep coming back…