Will the Guru

Functional Requirements

• Define system behavior what a system is supposed to do
• ex) The system should allow applications to exchange messages

How to define Functional Requirements

1. Who is going to use the system ?
   • ex) Youtube – viewers / content creators
   • ex) Rate Limiter – web services
2. How are they going to use the system ?
   • ex) Youtube (Content Creators) – Upload videos / Create posts / View analytics..
   • ex) Rate Limiter – ..

=> Interviewer is checking how the interviewee is breaking down the ambiguious problems into smaller manageable ones

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Non-Functional Requirements

• Define qualities of a system how a system is supposed to be
• ex) Scalable, Highly available, Fast

Reference

• https://leetcode.com/explore/interview/card/system-design-for-interviews-and-beyond/