Full Stack Developer | React | Node.js | TypeScript | Shopify | E-commerce

Full Stack Developer with hands-on experience building and scaling e-commerce platforms, custom Shopify solutions, and web applications. I have a strong background in React, Node.js, TypeScript, and integrations with payment and shipping providers. I focus on delivering robust, maintainable, and user-centric solutions, always applying best practices in code quality, architecture, and performance.

Frontend: React.js, TypeScript, JavaScript (ES6+), Next.js, Tailwind CSS, HTML, CSS

Backend: Node.js, Express, REST APIs, GraphQL, Shopify Liquid, Shopify CLI

Database: PostgreSQL, MongoDB

DevOps & Tools: Docker, Git, GitHub, VS Code, Figma

E-commerce: Shopify (custom themes, apps, integrations), Amazon Seller Central, Klaviyo, Meta Business Suite

Acting as the lead technical partner for an international luxury fashion brand, overseeing the entire e-commerce ecosystem, from frontend development to multi-channel integration and marketing automation.

Key Achievements & Responsibilities:

• Custom Theme Development: Engineered custom sections using Liquid, HTML, CSS, and JS, including advanced navigation menus, "Shop the Set" features, and responsive carousels, improving UI/UX for mobile and desktop.
• Marketplace Expansion (Amazon US): Led the technical launch on Amazon Seller Central via Shopify Marketplace Connect. Handled complex verification processes, catalog synchronization, and inventory logic between platforms.
• Growth Engineering & AdTech: Solved critical blockers in Google Merchant Center (policy compliance, feed diagnostics) and implemented robust tracking for Meta Ads (CAPI, Pixel events) and Google Ads (Performance Max), enabling scalable paid media campaigns.
• Marketing Automation: Architected and deployed comprehensive Klaviyo flows (Welcome Series, Abandoned Cart, Post-Purchase) and optimized email templates for higher conversion rates.
• SEO & Performance: Executed technical SEO audits (meta tags, schema markup, URL structures) for over 400 SKUs and optimized site performance (Core Web Vitals) through image compression and code minification.
• AI Integration: Leveraged AI tools for content creation, including generating video assets from static images for social media ads and enhancing product imagery.

Skills: Shopify Liquid · Amazon Seller Central · Google Merchant Center · Meta Business Suite · Klaviyo · Technical SEO · E-commerce Strategy · Full Stack Development

Founded and manage Martin4Shop, a men’s fashion e-commerce built from scratch on Shopify. Responsible for all areas of the business, combining technology, marketing, and operations.

Main responsibilities:

• Technical development: built and maintained the Shopify/Liquid, React.JS, Hydrogen, Remix and Tailwind CSS.
• Sales optimization: integrated marketing tools, automated stock management, and created performance reports.
• Customer support: provided direct assistance via email and WhatsApp, maintaining high customer satisfaction.
• Digital marketing: managed campaigns on Facebook/Instagram Ads and Google Ads, and developed branding strategies for a young target audience.
• Business management: handled finances, pricing strategies, and sales reports.

Key results:

• Active and profitable store since 2021, with over $80,000 in total revenue.
• Developed lean and automated operations, ensuring efficiency in a solo-managed business.
• Built a loyal customer base with repeat purchases and social media engagement.

Skills: Full Stack Development · React.js · Shopify · E-commerce · SEO

• Led the re-architecture of the Product Detail Page and custom variant logic for a premium fashion e-commerce.
• Developed advanced Shopify theme customizations (Liquid, JS), dynamic pricing engine, and AJAX cart flows.
• Improved performance, code quality, and implemented CRO features for higher conversion rates.

• Full stack development and Shopify specialist for a high-performance online store.
• Advanced theme customizations (Liquid, JS), upsell offers, dynamic checkouts, and mobile-first UX/UI.
• Built automations and messaging flows with Mailchimp, Zapier, and WhatsApp integrations.

• Front-end development of an e-commerce platform using React, integrated with Shopify.
• Created new interfaces from Figma designs, ensuring high performance and security standards.
• Delivered a robust, responsive, and integrated user experience for the French market.

• React.js, TypeScript, JavaScript (ES6+)
• Node.js, Express, REST APIs
• Shopify Liquid, Shopify CLI, Hydrogen, Remix
• PostgreSQL, MongoDB
• Docker, Git, GitHub
• E-commerce integrations (shipping, payments, analytics)
• Technical SEO, performance optimization
• UI/UX best practices

• Computer Engineering — Universidade São Francisco
• Full Stack Development — Specialized courses and bootcamps
• Shopify Partner Academy — E-commerce Development

• 🌐 Portfolio: www.matheusabrahao.com.br
• 📧 Email: contato.matheusabrahao@gmail.com
• 💼 LinkedIn: linkedin.com/in/abrahao-dev
• 💻 GitHub: github.com/abrahao-dev

Open to new opportunities as a Full Stack Developer specializing in e-commerce and scalable web applications. Available for remote positions and international collaborations.