Nah, you use similar knowledge all the time in lots of different systems in different fields. You’re not designing a production system in an interview scenario;

Nah, you use similar knowledge all the time in lots of different systems in different fields. You’re not designing a production system in an interview scenario; you are demonstrating critical thinking, showing that you understand how to break down a problem and sketch out a solution, and can clearly and thoroughly explore the different constraints that need to be considered. These are general purpose skills.