![Diego Costa](https://jobicy.com/react/themes/app/images/avatar.jpg) Diego Costa # Senior Shopify Developer Open to offers · Member since 20 Jul 2026 [Message](https://jobicy.com/dashboard-page.md) ShareLocationCuritiba, BrazilDesired salaryUnspecifiedWork preferenceRemote Only / Full Time, Contract, FreelanceExperience levelSenior * [Overview](#overview) * [Portfolio 0](#portfolio) * [Services 0](#services) ## About Professional summaryI am a Senior Shopify Developer with over 8 years of experience building and scaling ecommerce stores across freelance, agency, and in-house environments. I specialize in custom Shopify theme development, Liquid, app integrations, and conversion rate optimization, with a strong focus on improving site performance and checkout experience. I have worked with DTC brands and ecommerce clients across Brazil, the UK, and the US, delivering end-to-end solutions from architecture and integrations to A/B testing and post-launch optimization. I am comfortable collaborating closely with marketing, design, and growth teams to translate business goals into practical storefront features and measurable improvements. My background includes building custom Shopify Functions, storefront enhancements, and third-party integrations that support subscriptions, loyalty, personalization, analytics, and merchandising workflows. I also bring experience in QA, cross-browser testing, SEO fundamentals, and mentoring junior developers on best practices and Shopify Plus architecture. ## Skills 21 capabilities[A B Testing](https://jobicy.com/talent/a-b-testing.md)[Conversion Rate Optimization](https://jobicy.com/talent/conversion-rate-optimization.md)[Cross Browser Testing](https://jobicy.com/talent/cross-browser-testing.md)[CSS](https://jobicy.com/talent/css.md)[Git](https://jobicy.com/talent/git.md)[Google Analytics](https://jobicy.com/talent/google-analytics.md)[Google Tag Manager](https://jobicy.com/talent/google-tag-manager.md)[GraphQL](https://jobicy.com/talent/graphql.md)[HTML](https://jobicy.com/talent/html.md)[JavaScript](https://jobicy.com/talent/javascript.md)[jQuery](https://jobicy.com/talent/jquery.md)[Liquid](https://jobicy.com/talent/liquid.md)[Postman](https://jobicy.com/talent/postman.md)[QA](https://jobicy.com/talent/qa.md)[REST](https://jobicy.com/talent/rest.md)[Scrum](https://jobicy.com/talent/scrum.md)[Shopify Admin API](https://jobicy.com/talent/shopify-admin-api.md)[Technical SEO](https://jobicy.com/talent/technical-seo.md)[Theme Architecture](https://jobicy.com/talent/theme-architecture.md)[TypeScript](https://jobicy.com/talent/typescript.md)[Vue.Js](https://jobicy.com/talent/vue-js.md) ## Tech stack & tools Working toolkit ### Application Utilities [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/postman/postman-original.svg) Postman](https://jobicy.com/talent?tool=postman.md) ### Design [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/figma/figma-original.svg) Figma](https://jobicy.com/talent?tool=figma.md) ### Development [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/git/git-original.svg) Git](https://jobicy.com/talent?tool=git.md) ### Languages & Frameworks [![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/react/react-original.svg) React](https://jobicy.com/talent?tool=react.md)[![Image](https://cdn.jsdelivr.net/gh/devicons/devicon@master/icons/typescript/typescript-original.svg) TypeScript](https://jobicy.com/talent?tool=typescript.md) ## Experience Career history ### Senior Shopify Developer · Mejix May 2024 – Apr 2026Owned end-to-end development of custom Shopify themes and apps for US-based DTC brands using Liquid, React, and TypeScript. Implemented and analyzed A/B tests with Google Analytics, GTM, and CRO platforms. Optimized site performance, Core Web Vitals, and SEO fundamentals. Built custom Shopify Functions and app integrations for subscriptions, loyalty, and personalization. Conducted QA and cross-browser testing ahead of major launches and campaigns. ### Senior Shopify Developer · Blubolt Sep 2022 – Feb 2024Led custom theme development and section-based builds for UK and EU ecommerce clients on Shopify and Shopify Plus. Designed and implemented A/B testing setups to support data-driven decision making. Built and maintained custom Shopify apps and storefront integrations using JavaScript and the Shopify API. Improved checkout and post-purchase experience through custom scripts and app integrations. Mentored junior developers on Liquid best practices, code review standards, and Shopify Plus architecture. ### Shopify Developer · Amoni Apr 2020 – Jul 2022Built and customized Shopify themes using Liquid, HTML, CSS, and JavaScript. Developed custom storefront features including product filtering, size guides, and bundle logic. Integrated third-party apps for reviews, shipping, and marketing. Resolved cross-browser and cross-device compatibility issues. Partnered with design and marketing teams to implement campaign and landing page requirements. ### Shopify Developer · Upwork Mar 2018 – Jul 2019Delivered Shopify development projects for international clients in a freelance remote setting. Logged 148 billed hours across a total contract value of $6,200. Maintained a 98% Job Success Score by meeting deadlines, scope, and quality expectations. Handled theme customization, bug fixes, and small feature builds for independent merchants. ## Education Learning history ### Federal University of Santa Catarina 2015 – 2019Bachelor of Computer Engineering, Computer Engineering Bachelor's degree in Computer Engineering. This professional hasn’t added portfolio projects yet. This professional hasn’t listed any services yet.