You built the search with me.

From a thumb on a phone to a shelf in a store. You learned:

• How a request travels: DNS, CDN, firewall, load balancer, containers.
• Why a VPC has public and private subnets, spread over two zones.
• How a search index, a distance filter and a live stock check answer three questions at once.
• How a cache, a stream and a ranking model keep search fast, fresh and useful.
• How to watch it, and how to lock it.