Jace Guinto

Built and maintained responsive, production-ready Shopify Plus storefronts across multiple clients using React, Remix, Vue.js, TypeScript, JavaScript (ES6+), HTML5, and CSS3 — delivering reusable, component-driven UI patterns and scalable features across devices and browsers. Translated Figma designs into pixel-perfect storefront experiences using Liquid, CSS, and JavaScript, maintaining accessibility and Core Web Vitals targets. Developed custom Shopify themes and storefront functionality to support tailored user experiences and merchandising goals. Implemented platform automations, storefront enhancements, and third-party integrations (Amazon, Walmart, Klaviyo, Recharge, Google Analytics) via GraphQL, REST APIs, webhooks, and Vue.js. Engineered backend Shopify solutions using Ruby in Shopify Scripts, and built Checkout Extensions and custom apps with React and GraphQL to support multi-currency functionality and custom checkout enhancements. Built and maintained Shopify integrations

Engineered reusable, client-editable page and section templates using HTML5, CSS3, JavaScript, and PHP/Liquid, standardizing layout patterns to reduce duplication and accelerate delivery. Refactored inherited codebases to improve Core Web Vitals and PageSpeed scores, while eliminating technical debt and stabilizing cross-browser behavior. Ensured ADA/WCAG-compliant UX with semantic HTML, ARIA, keyboard navigation, and accessible color contrast. Built modular marketing email templates using Django templating, rendering dynamic, data-driven content for scalable campaigns. Optimized the end-to-end customer journey across landing pages, PDPs, cart, and checkout — leveraging Shopify apps to A/B test content and improve conversion rate, AOV, and total sales.

Maintained and extended production storefront code by building new templates and sections and resolving theme/app integration conflicts. Implemented accessibility and SEO best practices, achieving PageSpeed Insights scores above 90 on mobile and desktop. Developed responsive marketing email templates using custom CSS, HTML, and Django template tags. Optimized the end-to-end customer journey across landing pages, PDPs, cart, and checkout — leveraging Shopify apps for A/B testing. Built backend Shopify solutions including Checkout Extensions and custom apps using React, GraphQL, and Ruby in Shopify Scripts to support tailored storefront and operational functionality.