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I'm François-Xavier Chain, a Senior Full-Stack Developer specializing in Shopify and e-commerce solutions. With deep expertise in Shopify Plus, theme development, and API integrations, I help brands build high-performing, scalable online stores. I'm skilled in migrating platforms, optimizing store speed, and crafting tailored solutions to match complex business needs.…

François-Xavier Chain

Full Stack Developer, Web Developer, Front-End Developer, +1

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I'm François-Xavier Chain, a Senior Full-Stack Developer specializing in Shopify and e-commerce solutions. With deep expertise in Shopify Plus, theme development, and API integrations, I help brands build high-performing, scalable online stores. I'm skilled in migrating platforms, optimizing store speed, and crafting tailored solutions to match complex business needs.…

Available to hire

I’m François-Xavier Chain, a Senior Full-Stack Developer specializing in Shopify and e-commerce solutions. With deep expertise in Shopify Plus, theme development, and API integrations, I help brands build high-performing, scalable online stores.

I’m skilled in migrating platforms, optimizing store speed, and crafting tailored solutions to match complex business needs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

French

Fluent

Work Experience

Senior Shopify Developer (Freelance) at Self-employed / Freelance

May 1, 2023 - Present

Build and maintain Shopify and Shopify Plus stores for direct-to-consumer brands; handle WooCommerce migrations; integrate custom features using Vue.js and Shopify APIs; provide Shopify retainers including technical support, speed optimization, and code audits; write technical documentation and client proposals for custom projects.

Full-Stack Developer at Arneo Consulting

November 1, 2017 - May 1, 2023

Delivered Shopify Plus projects for large brands, including theme builds and app integrations; migrated and supported stores on Magento, WordPress, and Shopify; led CI/CD workflows using GitLab and Jenkins; developed custom web apps for clients in the airline and retail sectors; managed server-side configurations (Varnish caching, Composer, Docker); authored technical specifications and scoped development efforts for clients.

Web Tools Developer at Crédit Agricole Technologies

May 1, 2017 - July 1, 2017

Modernized internal tools by migrating legacy Excel systems to PHP-based web apps; deployed apps on LAMP stacks and documented architecture for technical teams.

Web Developer / SEO Specialist at dMedia LLC

July 1, 2004 - August 1, 2010

Delivered e-commerce and marketing projects end-to-end for brands like Skullcandy; managed LAMP servers and optimized SEO and PPC campaigns.

Front-End Developer at Buffalo Technologies

May 1, 2013 - September 1, 2013

Built admin interfaces for storage devices using Ext JS and Python; coordinated with QA for testing and validation.