"Macgillivray, though, also does a bit of engineering of his own. After leaving Twitter, he hand-coded a script for resurfacing old Gmail messages to which he hadn't yet replied."

The article links to https://gist.githubusercontent.com/amac0/6b17b0ca497e9cb1f37... , which has a comment that says:

* This script is based on and is nearly identical to: * http://jonathan-kim.com/2013/Gmail-No-Response/

I don't think modifying an existing script counts as "hand-coded". Anyway, I still find it interesting that WashingtonPost links to a javascript file directly.