Where does Cal Henderson work?

Cal Henderson is Co-founder & CTO at Slack and Founder at Slack.

What companies did Cal Henderson found?

Cal Henderson founded Slack, Slack.

Cal Henderson

Unicorn founder

Co-founder & CTO at Slack · Founder at Slack

San Francisco, CA

FoundedSlack$7.1B Slack

About

Cal Henderson co-founded Slack in 2013 and has been its CTO throughout, having previously been an early engineer and architect at Flickr with Stewart Butterfield. He built the real-time messaging infrastructure that carried Slack from launch through a 2019 direct listing and the $27.7B Salesforce acquisition in 2021, and wrote Building Scalable Web Sites.

Co-founder & CTO at Slack

Intro paths

→

In turn, Cal can intro founders to Slack's investors below.

Slack's investors · 39

1991 VenturesLondon · $504K checks AccelPalo Alto · $1.6M – $70M checks ACME CapitalSan Francisco Aglae VenturesParis · $108K – $5.4M checks Altos VenturesBurlingame · $1M – $3M checks Andreessen HorowitzMenlo Park · $500K – $50M checks Atlassian Ventures$1M – $5M checks Bloomberg BetaSan Francisco · $25K – $1M checks Coatue ManagementNew York · $1M – $20M checks Comcast VenturesNew York · $2M – $15M checks Craft VenturesSan Francisco · $50K – $50M checks EQUIAMSan Francisco · $1M – $10M checks Felicis VenturesSan Francisco · $500K – $15M checks FundersClubSan Francisco · $250K – $5M checks Global Founders CapitalBerlin · $637K – $32M checks Glynn Capital ManagementMenlo Park GP BullhoundLondon GV (Google Ventures)Mountain View · $250K – $50M checks High AlphaIndianapolis IVP (Institutional Venture Partners)San Francisco · $15M – $75M checks Khosla VenturesMenlo Park · $5K – $50M checks Kleiner PerkinsMenlo Park · $500K – $15M checks Light Street CapitalPalo Alto Lowercase CapitalJackson MicroVenturesAustin · $150K – $1M checks Moonshots CapitalAustin · $5K – $2.5M checks Mudita VentureDetroit · $500K – $1M checks Next Play VenturesMenlo Park · $100K – $5M checks Night CapitalCapitola Notable CapitalSilicon Valley · $5M – $50M checks S32Palo Alto Section 32Palo Alto Slow VenturesSan Francisco · $50K – $1M checks SoftBank Vision FundLondon Spark CapitalSan Francisco · $500K – $25M checks SV AngelSan Francisco Unanimous CapitalMenlo Park WEtech AllianceWindsor Wireframe VenturesSan Francisco · $500K – $2M checks

Co-founders at Slack

Stewart ButterfieldCo-founder & CEO

Founder at Slack

Intro paths

→

In turn, Cal can intro founders to Slack's investors below.

Slack's investors · 1

Acrew CapitalSan Francisco · $1M – $15M checks

Experience

Slack Technologies, IncCo-founder & CTO2009 — 2024San Francisco, CA
FlickrHead of Engineering2003 — 2009San Francisco Bay Area
EMAPDirector of Technology2001 — 2004Greater London, England, United Kingdom

Education

Birmingham City UniversityBSc, Software Engineering
Sharnbook Upper School

Skills & more

CMS3JavaScript27Flash3APIs1Mobile Applications7jQueryPHP21MySQL4Web Applications13HTML 5Web Development37Scalability16

+12 more

SubversionUser ExperienceProgrammingSoftware DevelopmentCSSHTMLWeb ServicesRubyScrumFront-endOOPActionScript

From Cal's professional profile.

Frequently asked questions

Where does Cal Henderson work?: Cal Henderson is Co-founder & CTO at Slack and Founder at Slack.
What companies did Cal Henderson found?: Cal Henderson founded Slack, Slack.