## Notes [Stack Overflow Architecture - YouTube](https://www.youtube.com/watch?v=fKc050dvNIE&list=PLCRMIe5FDPsd0gVs500xeOewfySTsmEjf&index=32) It's actually a "monolith" consisting of - UI - Single service - Datastores - [[ElasticSearch]] - [[Redis]] - Other DB 9 on-prem servers, all running at 5-10% capacity. Optimized for reads. Most common page is not cached! Their SQL is actually running on RAM