Design Stock price alerting system

Sem observação adicional neste relato público.

I was asked a System Design at Uber, question similar to this scenario. One key requirement was that stock prices must be sourced directly from each country’s official stock exchange. Users should be able to subscribe to specific stocks they own or are interested in. For each subscribed stock, users may opt in to receive price-movement alerts. An alert must be triggered whenever the current market price increases or decreases by at least 5% compared to the stock’s previous closing price. The system needs to support multiple stock exchanges, process real-time or near-real-time price updates, and reliably notify only the users who explicitly registered for alerts on that specific stock. The body from stock exchange was ```json { "symbol": "stock", "closing_price: 100.00, "price": 95.0 } ```