Ephemeral Commerce

Because databases are too slow, Ron (former employee) decided to keep every shopping cart in a single instance's memory. Traffic is spiking, that instance is about to fall over, and the autoscaler that saves you also cycles instances out from under live sessions. The Job: Survive the flash crowd without dropping requests or latency, and keep carts intact even as instances scale up and get recycled mid-checkout. Fix Ron's "optimization" before it deletes the company's revenue.

Free to play, no account needed. A deterministic engine grades your design against this scenario's SLA - error rate, latency, and cost.