Shopify Engineer

About Worldside Worldside is the commercial operator for global sport. We're an AI company with our own AI operator. We run the global commercial business of sports clubs, leagues, tournaments, sports brands and sports retailers: fans, sponsors, kit, matchday and stores, localised for every market and run around the clock. Our clients keep their fans, their data and their revenue. We work behind the badge, never in front of it. The role You'll build the local stores that fans and customers actually use: a club's shop in Seoul, a tournament's store in New York, a golf brand's site in Dubai. Each one needs to feel local, load fast on match night and hold up when a new kit drops. You'll have 2–3 years of hands-on Shopify theme development behind you. You'll work closely with our product, design and commercial teams, and with the AI operator that runs the day-to-day work across our clients' stores. You'll own your work from first commit to production, with minimal oversight. What you'll do • Build and optimise bespoke Shopify themes in Liquid, JavaScript and CSS, from first design to launch. • Build stores for many markets at once: Shopify Markets, multiple languages, currencies, sizing, pricing and payment methods, so each one feels local rather than translated. • Build advanced features: custom filters, metafields and metaobjects, AJAX carts, predictive search, product bundles and pre-orders for kit launches. • Make stores fast and reliable at peak moments, such as match days, kit launches and tournament weeks, and keep Core Web Vitals healthy. • Build accessible, responsive storefronts that meet WCAG 2.2 AA. • Extend Shopify with Checkout Extensibility, Shopify Functions and Shopify Flow. • Build theme components that are reusable across clients, so one well-built section can serve many clubs and brands with their own look. • Integrate third-party apps and external APIs, including fan membership, ticketing, CRM, loyalty, ERP and logistics systems. • Help connect stores to our AI operator through the Shopify Admin and Storefront APIs and webhooks, with approvals, a record of every change, and the ability to undo it. • Use Git, Shopify CLI and CI to manage code, reviews and deployments safely across many stores. • Turn designs into pixel-perfect, responsive interfaces, working closely with design and product. • Work with commercial, content and partnership teams to launch campaigns, sponsor activations and seasonal drops on time. • Find and fix theme and frontend issues quickly, including out of hours around big sporting moments, on a fair rota. What you'll bring • 2–3 years of professional Shopify theme development, with live stores you can show us. • Strong Liquid, JavaScript (ES6+), HTML5 and CSS3/SCSS. • Experience with Online Store 2.0 themes: JSON templates, sections, blocks and the theme editor. • Confidence with Shopify CLI, Git-based workflows, Theme Check and safe deployment. • A track record of building advanced Shopify features (AJAX cart, predictive search, metafields, metaobjects). • Experience building fast, accessible, responsive frontends. • Experience integrating and customising third-party Shopify apps. • The ability to work on your own, solve problems and debug calmly under pressure. • Close attention to detail, and care for how things look and feel to the person using them. • Clear written English. Many colleagues and clients will be in other countries and time zones. Nice to have • Shopify Plus experience, including multiple expansion stores, Shopify B2B for wholesale, and Shopify POS for pop-ups and events. • Hydrogen, Remix or other headless Shopify builds. • Building for right-to-left languages or East Asian markets. • Experience in sport, fan engagement, ticketing or licensed merchandise. • Using AI coding tools well, and knowing when not to trust them. • An interest in AI agents and how they act safely on real systems. • A second language. How we work • Local, not translated. We build for the fan in Seoul at 9pm, not for head office. We test in the market, in the language, on the phone people actually use. • Always on, always in the rules. We move fast, but everything we ship is reviewed, recorded and reversible. • Honest. We say what we know and what we don't. We'd rather ask than guess, and we never make up a figure. • Small first steps. We ship something small that works, learn from it, then grow it. • Behind the badge. The club, the event or the brand is the star. Our work makes them look good in every market. • One team. Engineers, designers, commercial people and our AI operator work as one. Good ideas can come from anyone. What we offer • Salary and any equity or bonus — to confirm. • Holiday allowance — to confirm. • Pension — to confirm. • Hybrid or remote working pattern — to confirm. • Equipment and learning budget — to confirm. • A chance to help build a new company from the start, working with clubs, events and brands around the world. How to apply Apply using the form on this page. Attach your CV and include links to two or three Shopify stores you've built (and what you did on each), plus a few lines on the hardest Shopify problem you've solved, in your short note. Worldside is an equal opportunities employer. We welcome applications from everyone, and we'll make reasonable adjustments at any stage of the process. Just tell us what you need.