Cal Henderson

hiring me

Cal Henderson

San Francisco, USA

What Now?

What Then?

What I Do


I have a first class honors degree in Software Engineering with a specialization in building tools for Online Communities

I also have 6 A-Levels, including grade A Mathematics, Further Mathematics, Computing and Physics.

More Qualifications

I also hold a number of brainbench technical certifications.

I have master level certificates in Javascript, HTML, Perl, PHP, Windows 95, Windows 98 and Mathematics

I have expert level certificates in Delphi, Object Oriented Concepts, E-Commerce, Windows Administration, Software Analysis, RDBMS Concepts, Programmer/Analyst Aptitude, Industry Knowledge, XML Concepts, Internet Security and IIS Administration.

You can view my public transcript online.

What I've Done

I'm currently the Flickr Architect at Yahoo! Inc.

Before the 2005 aquisition by Yahoo, I was director of web development for Ludicorp Research & Development in Vancouver, where we created the Flickr product. Previously I've been technical director of special web projects (swp) for emap, a uk based media company, lead programmer at 5emedia (now evolving media), a web consultancy agency and lead programmer at Link Information Systems, a technology incubator.

What I've Actually Done

Besides boring work stuff, i've contributed to a bunch of projects and products including perl, parrot, ubb, phpmyadmin, wordpress, blogware, movabletype, http navigator and a bunch of others i've forgotten about.

At various times i've created and helped to run some large and small online communities, including iamcal, b3ta, ubbdev, ubbhackers, barbelith and a bunch of others.

I've written a few pieces of windows software as well as some commerical windows development. More of my code is available for free and is used in various free and commerical products and websites.

From time to time i've designed fonts and written articles.


PHP, Smarty, Perl, mod_perl, Template Toolkit, Mason, DBI, Parrot, Ruby, eRuby, mod_ruby, SQL, MySQL, Postgres / PostgreSQL, Oracle, C, C++, Pascal, BASIC, HTML, DHTML, Javascript, JScript, VBScript, ECMAScript, CSS, Visual Basic, ADO, XHTML, XML, XSLT, XPath, DTD, DOM, WAP, SOAP, XML-RPC, XML Schema / XSD, ASP, Flash, Flash MX, Director, Lingo, UNIX, Linux, Debian, Redhat, SuSE, Windows, Windows 95, Windows 98, Window NT 4, Windows 2000, Windows API, Assembler, Mac OS 9, OSX, OS 10.2, Apache, IIS, Access, MSSQL, UBB, Movabletype