What would the Architecture of Uber, Lyft be like?

Please fill me up with the possible architecture of Uber, Lyft like applications and their servers. What kind of technologies they use? The protocols for mobile-server communication? (esp tracking the user/car location and updating them live) https://www.youtube.com/watch?v=vujVmugFsKc This video explains a lot on server architecture and technology uber uses, but its bit old now. The speaker mentions 'mobiles update GPS data every 4 second', what would the protocol be in this case? Poker apps in common connects upto 9 players per table and updates the cards in realtime for each mobile, what protocol they use for mobile-server communication? technologies they use and architecture of their server? Few useful links http://yalantis.com/blog/uber-underlying-technologies-works/