Notes on scaling realtime messaging to a million messages per second at Koinex — The article is the development story of PushMan, our in-house realtime Publish-Subscribe (PubSub) system that delivers messages published from the polyglot Koinex platform (an ecosystem of microservices written using Node.js, Ruby, Java and other programming languages) to the users on the Koinex Web and Mobile app. The article aims to…