We've built a real-time content measurement layer for the entire web.
Our analytics platform helps digital storytellers at some of the web's best sites, such as Arstechnica, The New Yorker, TechCrunch, The Intercept, and many more. In total, our analytics system needs to handle over 100 billion monthly events from over 1 billion monthly unique visitors.
Our entire stack is in Python and JavaScript, and our team has innovated in areas related to real-time analytics, building some of the best open source tools for working with modern stream processing technologies. Our UX/design team has also built one of the best-looking dashboards on the planet, using AngularJS and d3.js. You can see some screenshots: https://www.parse.ly/dashboard/