Freelancer profile translated to English.
Back to original languageAbout Guillaume
I was CTO for 6 years at an e-commerce group with over €100M in revenue. I led the migration of 7 Magento sites without service interruption, managed a team of 20 people, and launched product configurators that no competitor offered. Before that, I was a (lead) developer for over 6 years, so I'm as comfortable coding as I am managing a roadmap or arbitrating a budget.
Today, I put this dual expertise to work for companies that need clarity on their e-commerce IT systems, whether it's an architecture audit, a migration, performance work, or simply a CTO for a project.
I'm also very interested in applied AI; I introduced Claude and n8n automations to my teams and enjoy helping companies save time on repetitive tasks.
If you're looking for someone who has run high-traffic sites, knows how to manage without losing technical focus, and isn't afraid to get their hands dirty with code, let's talk.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- Groupe MisterMenuiserieGroup CTOE-COMMERCEJanuary 2018 - January 2025 (7 years)Paris, France• Full stack: multi-brand front-end, ERP middleware and third-party connectors, API and cloud back-end, for a group with revenue > €100M.• Strategic vision & roadmap: Definition and management of the technical roadmap over 3 to 5 years. Investment arbitration, project prioritization, reporting to management.• Magento M1 to M2 Migration: Led the migration of 7 sites (budget, deadlines, risks) with a team of 20 people. No service interruption.• Interactive configurators: Launched online joinery configurators, the first of their kind on the market at the time. Project designed with business teams from the start, integrating manufacturing constraints into the UX.• AI & process automation: Deployed AI tools (Claude, Mistral API, n8n) within teams to automate internal workflows and reduce the workload on repetitive tasks.• Partner & contract management: Managed relationships with key publishers and service providers (Fastly, Hipay, Quanta, Mailjet…), oversaw contracts and negotiated prices.• Performance & customer experience: Improved Core Web Vitals and SEO, monitored key indicators with product and marketing teams.
- Groupe MisterMenuiserieLead DeveloperE-COMMERCEMay 2017 - January 2018 (8 months)Paris, France• Managed a team of 3 developers• Integration of third-party solutions (Akeneo PIM, Hipay, Zendesk) and managed production releases• Design of a Magento 1 product configurator: the first component of the innovation project later industrialized as CTO• Application maintenance for Magento sites
- InoviaWeb DeveloperE-COMMERCEMay 2016 - May 2017 (1 year)Paris, France• Design and development of Magento e-commerce sites for various clients, with end-to-end load testing• Development of marketable modules with high architectural value: social network connectors, SAP interfaces, import/export, quotes• Skill development in Magento 2 (architecture and patterns)
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Education
- Ingésup – Information Systems and Software EngineeringEngineering School2014Ingésup – Système d'Information et Génie Logiciel
- BTS – Electronic SystemsGustave Eiffel High School2011BTS – Systèmes électroniques