Bandit Baby
About Cal Henderson
Cal Henderson is the Co-founder and former CTO of Slack, a leading platform for modern team communication, which he helped build from inception through its IPO and subsequent acquisition by Salesforce. An experienced technology leader, he previously served as the Head of Engineering at Flickr, which was acquired by Yahoo. He is also the author of the best-selling book "Building Scalable Websites."
Career
Co-founder & CTO
Went public in 2019, acquired by Salesforce in 2021
Head of Engineering
Built at Ludicorp, acquired by Yahoo in 2005
Director of Technology
Director of Technology
Education
BSc
BSc - Software Engineering

N/A
Skills
Core technical and professional competencies derived from leading engineering teams at high-growth companies like Slack and Flickr.
Scalability
System Architecture
Web Development
APIs
PHP
MySQL
JavaScript
CMS
Mobile Applications
CTO Leadership
Engineering Management
Product Strategy
Team Building
Technical Due Diligence
Public Speaking
Authoring
B3TA Co-creation
Creative Community Building
Technical Writing
Domains
Enterprise Software, Team Communication, SaaS, Cloud Computing
Social Media, Digital Photography, Web Infrastructure, Gaming
Tags
Visionary, Technical Leader, Author, Pragmatic, Builder
Scalability, Engineering Culture, Product-Focused, Open Source Contributor
Recent Content
William Franklin Henderson
Conference time
Totoro cream puffs
Frequently Asked Questions
A robotic, objective summary of Cal Henderson's career focusing on his co-founding role at Slack and his previous tenure at Flickr.
What is Cal Henderson's role at Slack?
Was Cal Henderson Head of Engineering at Flickr?
Yes, he served as the Head of Engineering at Flickr from December 2003 until April 2009, prior to co-founding Slack.
Did Cal Henderson write "Building Scalable Websites"?
Yes, he is the author of the best-selling book "Building Scalable Websites," which details engineering and technology practices.
How long was Cal Henderson at Slack Technologies?
Cal Henderson was with Slack Technologies, Inc. for approximately 15 years, from its founding in April 2009 through March 2024.
What happened to Slack Technologies, Inc.?
Slack Technologies, Inc. went through an IPO and was subsequently acquired by Salesforce. Cal Henderson helped build the platform through this acquisition.


