About this role
Salary: £53,000 - 93,000 per year
Requirements: Strong commercial front-end engineering experience with JavaScript, TypeScript, HTML, CSS, and modern frameworksExperience taking ownership of a high-traffic ecommerce websiteDeep understanding of Core Web Vitals and browser profiling tools such as Chrome DevTools, Lighthouse, and WebPageTestPractical experience with GA4, Google Tag Manager, consent management platforms, and the wider martech stackMagento or Adobe Commerce experience is a strong plusAbility to investigate issues independently, form hypotheses, and find answers without waiting for a perfect ticketAbility to explain complex website issues clearly to non-technical stakeholdersA continuous improvement mindset, always looking for ways to make the website faster, simpler, and easier for customers Responsibilities: Own front-end performance end to end across desktop and mobileDrive measurable improvements in Core Web Vitals, including LCP, INP, and CLS, on the journeys that matter most to revenueAnalyse conversion data by device, browser, channel, and journey to identify friction that is costing salesTurn performance findings into a prioritised, commercially weighted roadmapBuild and run experiments, including quick front-end variants, A/B tests, and feature-flagged releasesUse experiment results to shape what we build nextProtect tracking and measurement by working closely with Marketing and Data to catch discrepancies in GA4, GTM, and the data layerReview and control third-party scripts and marketing technology, challenging anything that slows the site down without enough valueUse AI-assisted engineering tools to work fasterBuild monitoring that catches performance and tracking regressions before they become commercial problems Technologies: AICSSJavaScriptMagentoMarketingMobileTypeScriptWeb More:
We are Protein Works, a high-growth DTC nutrition brand with a clear mission to help people live healthier, happier lives through the power of nutrition. We are growing, investing, and hiring with purpose, offering the energy of a challenger and the foundations of a market leader. This is a hands-on engineering role at the point where Technology, ecommerce, and performance marketing meet, reporting directly into our Sales & Marketing Director and working closely with our Technology Director. We offer exclusive staff discounts, private healthcare, a birthday day off, a pension scheme, a unique bonus scheme, a cycle to work scheme, access to retail discounts, staff socials and events, a state-of-the-art PW Campus, WFH on Fridays, and refreshments on-site.
last updated 33 week of 2026