Cal Henderson
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Cal Henderson

Slack CTO; "Building Scalable Web Sites"

Co-founder and CTO of Slack and former engineering lead at Flickr, known for scaling web systems and building developer-centric product culture.

@iamcalWikipedia
#22Technical Founders
59/ 100
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20
Top 100 Technical Founders
Rank #22·Slack CTO; "Building Scalable Web Sites"
Appears alongside

Top neighbors of Cal Henderson

8people
01
Adam Bry
Skydio co-founder; autonomous-flight engineering posts
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02
Adam Wathan
Tailwind CSS; "Refactoring UI"
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03
Adam Wiggins
Heroku co-founder; "12-Factor App"
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04
Adrian Holovaty
Django co-creator; Soundslice
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05
Anatoly Yakovenko
Solana; "8 Innovations" technical paper
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06
Andrej Karpathy (founder side, Eureka Labs)
education-stack writing
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07
Aravind Srinivas
Perplexity; retrieval/LLM-stack essays
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08
Armon Dadgar
HashiCorp co-founder; "Tao of HashiCorp" essays
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Last updated
10 May 2026
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