Pagerduty, Inc.
A maker of cloud software that helps companies detect, route, and respond to IT outages and technical problems before they spiral out of control. Its incident-management platform pings the right on-call engineer at the right moment and automates the fix-it steps, so it's used by the operations and DevOps teams that keep websites and apps running. Three former Amazon software engineers founded it in 2009 in Toronto, and the name comes straight from their old gig: at Amazon they had to carry physical pagers on their belts, a duty the engineers called "pager duty."