Problem Statement:

Design System where User can create alerts on StockOptions

• Raise an Alert When "APPL" stock transaction happens for more than $100
• Raise an Alert When "GOOGL" stock transaction happens for less than $40

You have one black-box Api say market-api

• you can call for particular stockoption and data will keep on flowing for that stockoption in form of say json , and will keep on flowing ; like below json

				{
					string company;// Apple
					double price; // 134.22
					int nb_shares;//100
					long timestamp;//24542212
				},...

Some clarifications he gave -> Assume 100 thousand stockoptions like "APPL" , "GOOGL" ,....

Design system for this , discuss about databases,scaling, how to keep service 24*7 hours running , how will you handle if service crashes,..

I was not expecting High Level Design in Fresher Interview