- Programming(1999-)
- Leadership(2012-)
- C/C++(2002 - 2012)
- *nix (Gentoo, Ubuntu, Mac OS X)(2002 - 2012)
- Emacs(2002 - 2012)
- Python(2002 - 2012)
- VCS (CVS, SVN)(2007-2012)
- Golang(2009-)
- World of Warcraft(2004-2007)
- TDD (xUnit, Fitnesse, Cucumber)(2007-2012)
- DVCS (Git)(2007-2012)
- SQL(2007-2012)
- Web UI (HTML, CSS, Javascript)(2007-2012)
- NoSQL(2009-2012)
- AWS(2009-2012)
- Obj-C(2011-2012)
- Haskell(2013-)
- Brewing(2013-)
- Managing(2014-)
- Elixir(2015-)
- 1999
- ...
- 2004
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- 2007
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- 2012
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