Building for SF

Building for SF is a free two-day civic buildathon in San Francisco running September 11–12, 2026. The event brings builders, technologists, founders, and community members together to develop practical projects designed to help the city work better. Hosted at Yes SF Headquarters and organized by Lily Chandrasekher, the program is relevant to startup teams and civic innovators interested in public-interest technology, local problem-solving, and rapid collaborative prototyping. Its newly detected listing adds a timely builder-focused event to the San Francisco startup and technology calendar.