Cal Henderson

San Francisco, California, United States

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Summary

🤩

Rockstar

🎓

Top School

Cal Henderson is a seasoned technology leader and co-founder with 23 years of experience building scalable, user-focused web platforms, best known as Co-founder and CTO of Slack. He previously led engineering for Flickr and co-founded Glitch, blending product-driven engineering with strong operational discipline that helped take Slack public and through acquisition by Salesforce. An author of the best-selling Building Scalable Websites, Cal combines hands-on full-stack development (notably practical emoji and oEmbed tooling) with large-scale system design and team leadership. Based in San Francisco, he has a track record of turning playful web ideas into robust, widely adopted infrastructure while keeping developer experience front and center.

23 years of coding experience

23 years of employment as a software developer

BSc Software Engineering, BSc Software Engineering at Birmingham City University

Sharnbook Upper School

Stackoverflow

Stats

16reputation

1kreached

2answers

0questions

Github Skills (20)

json10

javascript10

scripting10

image-processing10

testing10

emoji10

css10

regular-expression10

php10

unicode10

yaml9

performance-optimization9

html8

documentation8

ui-design8

Programming languages (12)

TypeScriptC++HackCScalaJavaScriptPHPLua

Github contributions (5)

iamcal/php-emoji

Oct 2009 - May 2021

A PHP Emoji conversion library

Role in this project:

Back-end Developer

Contributions:111 commits, 9 PRs, 18 pushes in 11 years 8 months

Contributions summary:Cal appears to have been involved in a project focused on emoji handling and conversion within a PHP environment. The commits show the user refactoring and optimizing the PHP code and data structures for improved speed and correctness, as well as adding tests to validate the changes. Their work includes adding new features and working with a CSS file. There's also evidence of debugging and the correction of a "dumb mistake," which led to improvements in code quality.

php

iamcal/js-emoji

Jan 2013 - Oct 2022

A JS Emoji conversion library

Role in this project:

Back-end Developer & UI Designer

Contributions:345 commits, 110 PRs, 155 pushes in 9 years 11 months

Contributions summary:Cal's primary contribution was to build a JavaScript library for converting and replacing emoji characters. They focused on generating the necessary JavaScript code to replace emoji at display time, constructing a replacement map and regular expression. Additionally, the user designed the basic CSS layout and functionality to display the converted characters within the user interface.

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