Lot's of analytics (NewRelic, gaug.es, segment.io)
Skillwise you'd need great js, great d3, eye for design, patience to layout a million state transitions and animate them all with css + js, wiring up a million data sources & api's, jquery, ajax, pushstate, and pretty legit backend skills to keep this thing running ATM.
He's using d3, jQuery, mapbox, jquery-pjax
Lot's of analytics (NewRelic, gaug.es, segment.io)
Skillwise you'd need great js, great d3, eye for design, patience to layout a million state transitions and animate them all with css + js, wiring up a million data sources & api's, jquery, ajax, pushstate, and pretty legit backend skills to keep this thing running ATM.