Software System Design

What is Software System Design:
Software System Design is the process through which a particular Software System goes through. It is the process of designing
1. Architecture of the software system
2. Interface of the software system
3. Modules and components of the software system
Software System Design in no different from say designing a building, Its all starts from
a. understanding the requirement of the building
b. creating the plan and architecture of the building
c. developing each independent components of the building and then inter-linking each component after which the building is ready for use.

This Group is created to discuss, solve and collaborate on Software System Design problem that we face in day to day software development and design. This group will also primarily discuss System design problems that is asked in various Software Companies Interviews. I would urge people to join, contribute the problems that they have faced on work, interviews, etc.
Let's discuss on each of the problems posted to learn and build some awesome products.