Cal Henderson
Cal co-founded Slack and led its engineering, research and design teams as CTO. He previously built and led engineering at Flickr, and now advises and invests in software founders.
Explore Cal Henderson’s experience ↗Flickr experience
Before co-founding Slack, Cal Henderson built and led the engineering organisation at Flickr. His public biography describes work from its founding through its acquisition by Yahoo.
Flickr provides a second part of Cal’s technical operating background, alongside Slack. His profile connects these roles with his writing on scalable web systems so founders can assess the depth of his engineering experience.
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This is an independent guide to the people in our directory, not an official Flickr page or a complete list of its team.