List of design questions:

Design a system like

1. LRU Cache

2. URL Shortener (tiny URL)

3. Parking lot

4. Leaderboard

5. Generation of unique URL

6. Food Delivery App

7. Cab OR bicycle booking

8. Centralized Logger System

9. BookMyShow

10. Instagram

11. Cricinfo

12. Order Management System

13. Distributed job scheduler

14. Read Receipts mechanism in Whatsapp

15. Bus scheduling system

16. Ticket booking system

17. System to handle flash sales

18. Netflix

19. Access Management System

20. Multiplayer game

21. Railways Cloak Room

22. Management software for gaming parlor

23. Payment mechanism

24. Price automation system

25. Voice assistant used in mobile

26. Event booking system

27. MP3 player

28. File conversion tool

29. Torrent Client — For downloading files from the Internet

30. Notifications Service — when the price drops in real-time

31. Notifications Service — which sends email and SMS to buyer and seller for an e-commerce marketplace

32. Optimize the red and green lights in a traffic signal

If you think I’ve missed any problem, please suggest in the comments.

Tips to answer design questions:

1. Ask clarifying questions to resolve the ambiguity

2. Break-down the problems

3. Dive deep on implementation

4. Scaling of the design

HLD Expectations:

1. Requirement gathering and Defining System Constraints

2. Identify System Components

3. Associating and Coupling Components

4. Design Considerations — Fault tolerance, Scalability, Concurrency Control, etc.

5. Component Diagram — Explain the Responsibility of each component

LLD Expectations:

1. The candidate should be comfortable in class diagram and DB table schema implementation

2. Should know - How should the system handle failures, what can be done to prevent them

3. Identify Entities, Defining Entities and association

4. Coupling, Extendibility, and System Maintainability

5. Touch Base on Design Principles and Design Patterns and OOPS concepts