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

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.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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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.

Education

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Qualifications

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Industry Experience

Software & Internet, Media & Entertainment, Professional Services, Retail

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
See more