PubNub

PubNub is a Realtime Communication Platform and realtime infrastructure-as-a-service (IaaS) company based in San Francisco, California. The company makes products for software and hardware developers to build realtime web, mobile, and Internet of Things (IoT) applications.
PubNub's primary product is a realtime publish/subscribe messaging API built on their global data stream network which is made up of a replicated network of at least 15 data centers located in North America, South America, Europe and Asia. The network currently serves over 330 million devices and streams over a trillion messages per month.
History.
PubNub was founded in 2010 by Stephen Blum and Todd Greene. PubNub raised $4.5 million in Series A funding from Relay Ventures and TiE Angels in March 2012. They received their $11 million Series B round of funding in September 2013 from Scale Venture Partners, Relay Ventures and TiE Angels. In July 2015, PubNub received their $20 million Series C round of funding led by Sapphire Ventures. In September 2016, PubNub closed a $6 million venture round led by Cisco Investments and Ericsson. In April 2019, PubNub received their $23 million Series D round of funding, adding Hewlett Packard Enterprise to the list of investors.
Technology.
PubNub utilizes a Publish/Subscribe model for realtime data streaming and device signaling and supports all of the capabilities of WebSockets, Socket.IO, SignalR, WebRTC Data Channel and other streaming protocols. PubNub provides SDKs for over 70 different programming languages and environments including JavaScript, iOS, and Android, as well as JavaScript frameworks such as AngularJS, Ember.js, and Backbone.js. PubNub also provides client libraries for board platforms including Raspberry Pi, Arduino, Texas Instruments, and Microchip.