Sam Joch is a founder and CTO based in Paris with 13 years of experience building and scaling product-focused engineering teams and consumer-facing platforms. He blends hands-on front-end craftsmanship—evident from contributions to Mozilla’s Gaia/Firefox OS UI—with leadership roles that span startups and acquisitions, most recently founding Pillz and serving as CTO of Checkmyguest through its acquisition by OYO. Comfortable moving between prototyping, UX collaboration and production engineering, he has led small cross-functional teams to deliver polished user experiences and OTA firmware capabilities. His background includes long-term freelance work and multiple co-founder CTO stints, reflecting an entrepreneurial appetite for shipping end-to-end solutions. Notably, his early work on HTML5-based phone UIs shows a consistent focus on visual polish and pragmatic refactors that improve UX at scale.
DEPRECATED - Gaia is a HTML5-based Phone UI for the Boot 2 Gecko Project. NOTE: For details of what branches are used for what releases, see
Role in this project:
Front-end Developer
Contributions:227 commits in 1 year 4 months
Contributions summary:Sam primarily contributed to the front-end development of the Boot to Gecko (B2G) Gaia project, focusing on UI and visual enhancements. They implemented and refined the user interface for various applications, including the Clock, Video Player, Settings, Homescreen, and Browser. The user addressed visual issues, such as icon rendering and text truncation, and improved the user experience by polishing visual details. They also refactored code for the video player and updated the UI for a more modern feel.
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