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Gian Barros
As a seasoned Full-Stack Developer specializing in eCommerce solutions, I have over 6 years of expertise in delivering high-performing, user-centric applications. Proficient in modern frameworks like React.js, Next.js, Ruby on Rails, Django, and scalable architecture using Node.js, I excel in building end-to-end solutions. My specialization includes custom Shopify development, headless commerce, and multi-platform eCommerce integrations.
I leverage cutting-edge tools such as GraphQL, REST APIs, Tailwind CSS, Material-UI, and cloud services like AWS and GCP to develop scalable, secure, and high-converting applications. Adept at optimizing performance, crafting responsive designs, and integrating third-party APIs, I deliver digital solutions that drive business growth and customer satisfaction.
Work Experience
Senior Full-Stack Shopify Developer • HWC
August 2022 - October 2024
• Engineered headless Shopify projects using Hydrogen and Node.js to build high-performance, fully customizable storefronts with decoupled architecture.
• Developed scalable, multi-functional Shopify apps with GraphQL and AWS Lambda, integrating real-time inventory synchronization, custom reporting dashboards, and advanced order management workflows.
• Built RESTful and GraphQL APIs to enable seamless integrations with external CRM and ERP systems, such as NetSuite and HubSpot, ensuring data accuracy and workflow automation.
• Architected custom Ruby-based checkout solutions, incorporating advanced discount logic, tax calculations, and region-specific compliance handling.
• Leveraged Pagefly, Replo, and Tailwind CSS for building high-conversion landing pages and optimized product detail pages, improving client KPIs like bounce rate and sales conversion.
• Designed and implemented serverless architectures with AWS for custom Shopify app development, ensuring reliability and scalability.
• Optimized Liquid templates, JavaScript modules, and CSS assets to reduce page load times by 30%, enhancing performance scores in tools like Lighthouse and Google PageSpeed Insights.
• Google Analytics - Configured advanced tracking solutions within Shopify, using GA4 and custom scripts to monitor conversion funnels and customer journeys.
Shopify Developer • Le Olive
April 2021 - June 2022
• Built and deployed fully customized Shopify themes using Liquid, HTML5, CSS3, and JavaScript, ensuring responsive designs and mobile-first performance.
• Developed an order processing pipeline integrating Shopify with third-party logistics (3PL) providers using Node.js and GraphQL, automating shipment tracking and updates in real time.
• Created advanced multi-variant product selectors with dynamic pricing, inventory management, and custom cart rules, improving UX and reducing cart abandonment rates.
• Integrated payment gateways, such as Stripe, PayPal, and Braintree, into Shopify stores, ensuring PCI compliance and secure payment processing.
• Deployed Google Analytics scripts for event tracking, enabling insights into key user behaviors.
• Conducted end-to-end testing of custom Shopify apps and themes, ensuring seamless compatibility across modern browsers and device resolutions.
• Implemented SEO enhancements through schema markup, alt tags, and optimized meta tags, leading to a 40% increase in organic traffic.
• Configured marketing automation using tools like Klaviyo and Mailchimp, integrating them with Shopify for personalized email campaigns and customer segmentation.
Ecommerce Full-Stack Developer • Nomad Internet
March 2019 - February 2021
• Developed and managed eCommerce storefronts on platforms such as Shopify, WooCommerce, Drupal (senior-level expertise), and Wix, implementing custom functionalities tailored to complex business needs.
• Led senior-level Drupal development, including designing and building custom modules, themes, and views, ensuring compliance with Drupal’s best practices and security standards.
• Designed and deployed scalable API-driven middleware using Node.js to synchronize product, customer, and order data across platforms like Amazon, eBay, Etsy, Shopify, and Drupal Commerce.
• Optimized performance of high-traffic Drupal websites by implementing caching strategies (Varnish, Memcached), database query optimization, and front-end techniques like code-splitting, lazy loading, and asset compression, achieving page load speed improvements of over 50%.
• Configured and customized WordPress plugins for WooCommerce and extended Drupal Commerce functionalities, enabling advanced features like subscription billing, dynamic pricing, and shipping calculators.
• Built interactive dashboards for tracking sales, inventory, and customer behavior using React.js, integrating seamlessly with Shopify and Drupal data via GraphQL and REST APIs.
• Enhanced multi-platform product listings with SEO-optimized metadata and integrated analytics tools like Google Tag Manager to monitor traffic and conversion metrics.
• Deployed advanced caching mechanisms using Redis, Varnish, and CDN integrations, ensuring faster load times and reduced server latency for global users on Drupal and other platforms.
• Automated marketing workflows via Zapier, enabling real-time notifications, email triggers, and cross-platform data updates for Drupal and non-Drupal eCommerce systems.
• Managed Drupal migrations and upgrades, ensuring seamless transitions from earlier versions (Drupal 7 to Drupal 10), addressing custom modules, configuration management, and data migration challenges.
Junior Full Stack Engineer • Venngage
August 2017 - February 2019
• Designed scalable React.js front-end components and developed REST APIs with Node.js for a SaaS application, delivering seamless user experience.
• Integrated Web3 functionality into decentralized applications (dApps) by developing smart contracts on Ethereum using Solidity and implementing ERC20 and ERC721 token standards.
• Contributed to NFT minting platforms for the digital art and gaming industries, enabling secure transactions and robust metadata handling.
• Built modular back-end services for data processing and analytics using Python (Flask) and MongoDB, supporting a 50% increase in user data ingestion.
• Participated in DevOps processes, implementing CI/CD pipelines with Jenkins and containerizing applications using Docker for faster deployments.
• Conducted API load testing using Postman and Newman, ensuring back-end services scaled under high user load.
• Collaborated with UI/UX designers to implement responsive, accessible interfaces, improving user engagement metrics by 30%.
Education
2012 - 2017
De La Salle University
Computer Science
Skills
- React
- Shopify
- Shopify Development
- Node.js
- CRO
- SEO Optimization
- ruby
- NextJS
- theme customization
- WordPress
- Performance Optimization
- A/B Testing
- AWS
- GraphQL
- REST API
- CRM Software
- Headless Shopify Architecture
- Hydrogen Framework
- SQL
- GCP
Languages
- English — Professional
Gian Barros
As a seasoned Full-Stack Developer specializing in eCommerce solutions, I have over 6 years of expertise in delivering high-performing, user-centric applications. Proficient in modern frameworks like React.js, Next.js, Ruby on Rails, Django, and scalable architecture using Node.js, I excel in building end-to-end solutions. My specialization includes custom Shopify development, headless commerce, and multi-platform eCommerce integrations.
I leverage cutting-edge tools such as GraphQL, REST APIs, Tailwind CSS, Material-UI, and cloud services like AWS and GCP to develop scalable, secure, and high-converting applications. Adept at optimizing performance, crafting responsive designs, and integrating third-party APIs, I deliver digital solutions that drive business growth and customer satisfaction.
Work Experience
Senior Full-Stack Shopify Developer • HWC
August 2022 - October 2024
• Engineered headless Shopify projects using Hydrogen and Node.js to build high-performance, fully customizable storefronts with decoupled architecture.
• Developed scalable, multi-functional Shopify apps with GraphQL and AWS Lambda, integrating real-time inventory synchronization, custom reporting dashboards, and advanced order management workflows.
• Built RESTful and GraphQL APIs to enable seamless integrations with external CRM and ERP systems, such as NetSuite and HubSpot, ensuring data accuracy and workflow automation.
• Architected custom Ruby-based checkout solutions, incorporating advanced discount logic, tax calculations, and region-specific compliance handling.
• Leveraged Pagefly, Replo, and Tailwind CSS for building high-conversion landing pages and optimized product detail pages, improving client KPIs like bounce rate and sales conversion.
• Designed and implemented serverless architectures with AWS for custom Shopify app development, ensuring reliability and scalability.
• Optimized Liquid templates, JavaScript modules, and CSS assets to reduce page load times by 30%, enhancing performance scores in tools like Lighthouse and Google PageSpeed Insights.
• Google Analytics - Configured advanced tracking solutions within Shopify, using GA4 and custom scripts to monitor conversion funnels and customer journeys.
Shopify Developer • Le Olive
April 2021 - June 2022
• Built and deployed fully customized Shopify themes using Liquid, HTML5, CSS3, and JavaScript, ensuring responsive designs and mobile-first performance.
• Developed an order processing pipeline integrating Shopify with third-party logistics (3PL) providers using Node.js and GraphQL, automating shipment tracking and updates in real time.
• Created advanced multi-variant product selectors with dynamic pricing, inventory management, and custom cart rules, improving UX and reducing cart abandonment rates.
• Integrated payment gateways, such as Stripe, PayPal, and Braintree, into Shopify stores, ensuring PCI compliance and secure payment processing.
• Deployed Google Analytics scripts for event tracking, enabling insights into key user behaviors.
• Conducted end-to-end testing of custom Shopify apps and themes, ensuring seamless compatibility across modern browsers and device resolutions.
• Implemented SEO enhancements through schema markup, alt tags, and optimized meta tags, leading to a 40% increase in organic traffic.
• Configured marketing automation using tools like Klaviyo and Mailchimp, integrating them with Shopify for personalized email campaigns and customer segmentation.
Ecommerce Full-Stack Developer • Nomad Internet
March 2019 - February 2021
• Developed and managed eCommerce storefronts on platforms such as Shopify, WooCommerce, Drupal (senior-level expertise), and Wix, implementing custom functionalities tailored to complex business needs.
• Led senior-level Drupal development, including designing and building custom modules, themes, and views, ensuring compliance with Drupal’s best practices and security standards.
• Designed and deployed scalable API-driven middleware using Node.js to synchronize product, customer, and order data across platforms like Amazon, eBay, Etsy, Shopify, and Drupal Commerce.
• Optimized performance of high-traffic Drupal websites by implementing caching strategies (Varnish, Memcached), database query optimization, and front-end techniques like code-splitting, lazy loading, and asset compression, achieving page load speed improvements of over 50%.
• Configured and customized WordPress plugins for WooCommerce and extended Drupal Commerce functionalities, enabling advanced features like subscription billing, dynamic pricing, and shipping calculators.
• Built interactive dashboards for tracking sales, inventory, and customer behavior using React.js, integrating seamlessly with Shopify and Drupal data via GraphQL and REST APIs.
• Enhanced multi-platform product listings with SEO-optimized metadata and integrated analytics tools like Google Tag Manager to monitor traffic and conversion metrics.
• Deployed advanced caching mechanisms using Redis, Varnish, and CDN integrations, ensuring faster load times and reduced server latency for global users on Drupal and other platforms.
• Automated marketing workflows via Zapier, enabling real-time notifications, email triggers, and cross-platform data updates for Drupal and non-Drupal eCommerce systems.
• Managed Drupal migrations and upgrades, ensuring seamless transitions from earlier versions (Drupal 7 to Drupal 10), addressing custom modules, configuration management, and data migration challenges.
Junior Full Stack Engineer • Venngage
August 2017 - February 2019
• Designed scalable React.js front-end components and developed REST APIs with Node.js for a SaaS application, delivering seamless user experience.
• Integrated Web3 functionality into decentralized applications (dApps) by developing smart contracts on Ethereum using Solidity and implementing ERC20 and ERC721 token standards.
• Contributed to NFT minting platforms for the digital art and gaming industries, enabling secure transactions and robust metadata handling.
• Built modular back-end services for data processing and analytics using Python (Flask) and MongoDB, supporting a 50% increase in user data ingestion.
• Participated in DevOps processes, implementing CI/CD pipelines with Jenkins and containerizing applications using Docker for faster deployments.
• Conducted API load testing using Postman and Newman, ensuring back-end services scaled under high user load.
• Collaborated with UI/UX designers to implement responsive, accessible interfaces, improving user engagement metrics by 30%.
Education
2012 - 2017
De La Salle University
Computer Science
Skills
- React
- Shopify
- Shopify Development
- Node.js
- CRO
- SEO Optimization
- ruby
- NextJS
- theme customization
- WordPress
- Performance Optimization
- A/B Testing
- AWS
- GraphQL
- REST API
- CRM Software
- Headless Shopify Architecture
- Hydrogen Framework
- SQL
- GCP
Languages
- English — Professional