Open to opportunities

Mateo Lee

@mateolee

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Senior Shopify developer specializing in high-performance eCommerce and conversions.

Italy

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What I'm looking for

I'm seeking eCommerce-focused roles where I can build and optimize Shopify/WordPress stores, improve performance and conversions, collaborate with designers and marketers, and continue growing technical and product skills.

I'm a results-driven Shopify and WordPress developer with strong front-end and back-end skills, including HTML, CSS, JavaScript, PHP, and Liquid. I build and customize responsive, high-performance themes and apps that enhance user experience and drive conversions.

I have built third-party Shopify apps, integrated payment gateways and third-party apps, and implemented analytics through Google Tag Manager and Google Analytics to deliver data-driven improvements. My optimizations delivered measurable results: conversion rate increases, faster site speed, and SEO scores above 90%.

I collaborate closely with clients and teams to translate designs into functional stores, having implemented Figma designs, led QA reviews, and developed custom themes and pages across multiple stores. I also execute email marketing strategies using Klaviyo and other tools to boost sales and engagement.

I'm passionate about continuous learning and improving development processes, with hands-on experience in A/B testing, performance optimization, and plugin or app integrations that maintain reliability and scalability for growing eCommerce businesses.

Experience

Work history, roles, and key accomplishments

Senior Shopify Developer

First Pier

Jun 2024 - Sep 2025 (1 year 3 months)

Developed a third-party Shopify app and custom store pages, implemented GTM/GA-driven improvements that raised conversion rate by 0.42%, and drove a 14% lift in sales via Klaviyo campaigns while improving site speed by 12% and maintaining SEO score >90%.

Shopify Liquid JavaScript Google Tag Manager Google Analytics Klaviyo SEO

Junior Shopify Developer

Gianluca Rinaldi

Sep 2022 - Mar 2024 (1 year 6 months)

Created Figma designs and implemented custom Shopify themes, served on QA reviewing code and themes, and deployed email automations that increased Black Friday sales up to 287% while managing WordPress site updates.

Shopify Figma QA Email Automation WordPress Theme Development GitHub

Primary Developer

KikstartEcom

Apr 2020 - Jul 2022 (2 years 3 months)

Built and customized responsive Shopify and WordPress themes, improved SEO and content management, and integrated plugins and GitHub workflows to maintain and enhance store performance.