We designed a scalable key-value store using a load balancer, multiple application servers, a cache, and a replicated database. The application layer was scaled horizontally to handle peak traffic, while replicas were added to remove single points of failure. The cache reduced database load, and the database used replication and quorum for durability and availability.
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nice honest baseline. four boxes, no cleverness, and you can explain every one of them out loud. thats worth more in an interview than a fancy diagram