# 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: <a href="#id-7384" id="id-7384"></a>

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: <a href="#b78a" id="b78a"></a>

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: <a href="#id-2728" id="id-2728"></a>

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