François-xavier Costanzo
Web Designer Developper Freelancer
Paris, Ile-de-France
Summary
👤
Senior🎓
Top SchoolFrançois-xavier Costanzo is a Paris-based web designer and front-end developer with a decade of experience crafting responsive sites, design systems, and web apps for startups and freelance clients. He blends visual design and hands-on implementation—shipping UI assets, prototypes in Figma, and production-ready HTML/CSS with features like mobile menus and scrollspy—drawing on past roles at Sqreen and ShamanX. Comfortable across marketing sites and product front-ends, he has contributed front-end improvements to open-source projects such as the SaaS CTO Security Checklist. Outside client work he runs a popular YouTube channel documenting the long, hands-on renovation of his home, a hobby that highlights his patience for iterative design and practical problem solving.
10 years of coding experience
5 years of employment as a software developer
BTS Systèmes Électroniques, Électronique, BTS Systèmes Électroniques, Électronique at Paul LangevinTechnicien systèmes de détection et traitement de l'information, Ingénierie physique / physique appliquée, Technicien systèmes de détection et traitement de l'information, Ingénierie physique / physique appliquée at Armée de l'AirBachelor Webdesign, Internet, Bachelor Webdesign, Internet at SUP'Internet, l'école des hauts potentiels du Web
Github Skills (7)
html10
css10
javascript10
user-interface10
website-design8
site-design8
mobile-development7
Programming languages (2)
Github contributions (5)
sqreen/CTOSecurityChecklist
Oct 2016 - Feb 2019
The SaaS CTO Security Checklist
Role in this project:
Front-end Developer
Front-end DeveloperContributions:62 commits, 10 PRs, 34 pushes in 2 years 4 months
Contributions summary:François-xavier's commits primarily involve front-end development tasks within the "The SaaS CTO Security Checklist" repository. The contributions include modifications to HTML structure, the addition of OG (Open Graph) meta tags for social media sharing, and the integration of a mobile menu. Additionally, the user worked on styling, including updating the CSS and integrating a scrollspy feature to enhance user navigation.
checklistsecurityinfosecsaascto
sqreen/DevOpsSecurityChecklist
Apr 2017 - Feb 2019
Contributions:27 commits, 2 PRs, 10 pushes in 1 year 10 months
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