Architecture of Giants: Data Stacks at Facebook, Netflix, Airbnb, and Pinterest

https://blog.keen.io/architecture-of-giants-data-stacks-at-facebook-netflix-airbnb-and-pinterest-9b7cd881af54

Cheap flights and sleeps

http://www.fly4free.pl/ https://www.skyscanner.pl/ https://www.amoma.com/ https://www.booking.com/ https://www.airbnb.pl/