# [W.I.P.]

These designs are not fully polished yet — I’m documenting them as part of my learning and practice. I’d appreciate any suggestions or improvements so we can all grow and learn together.

# [Road to Google](https://leetcode.com/discuss/post/5851374/road-to-google-by-anonymous_user-yl1e/)


# [Solid Principles](https://leetcode.com/discuss/post/6546371/solid-principles-notes-by-anonymous_user-pep6/)

# Commonly Used Design Patterns

1. Creational Design Pattern
    - Singleton
    - Factory
    - Builder
    
2. Structural Design Pattern
    - Adapter
    - Facade 
    - Decorator
    - Composite

3. Behavioural Design Pattern
    - Strategy
    - State
    - Observer


# Low Level Design


# Games
1. [Chess](https://leetcode.com/discuss/post/7213491/chess-low-level-design-by-anonymous_user-ui9x/) 
2. [Tic Tac Toe]
3. [Snake & Ladder Game](https://leetcode.com/discuss/post/7210647/snake-ladder-lld-by-anonymous_user-q3r6/) 
4. [Snake Game](https://leetcode.com/discuss/post/7209855/snake-game-low-level-design-strategy-obs-xq2b/) 
5. [Tetris Game]
6. [Jigsaw Puzzle]
7. [Black Jack Game]


# Booking

1. [Parking Lot](https://leetcode.com/discuss/post/7220170/parking-lot-lld-by-anonymous_user-3h1f/) (Microsoft)
2. [Hotel Booking System]
3. [Car Rental System](https://leetcode.com/discuss/post/7204444/car-rental-system-lld-by-anonymous_user-37rd/)
4. [Library Management System](https://leetcode.com/discuss/post/7205594/library-management-system-lld-by-nikhil-se73j/)
5. [Flight Booking System]
6. [Google Calendar](https://leetcode.com/discuss/post/7213058/google-calendar-low-level-design-by-anon-15mc/) 
7. [Amazon Locker Service]
8. [Amazon Online Shopping System]
9. [Blinkit](https://leetcode.com/discuss/post/7244963/blinkitzepto-low-level-design-by-anonymo-02w3/)


# Vending Machine Related

1. [Vending Machine](https://leetcode.com/discuss/post/7233090/vending-machine-low-level-design-by-anon-g9p9/) 
2. [Coffee Vending Machine](https://leetcode.com/discuss/post/7241428/coffee-vending-machine-low-level-design-67ngn/)
3. [ATM]

# Infra

1. Notification System 
2. Payment System 

# Random

1. [Cricbuzz]
2. [Spilitwise](https://leetcode.com/discuss/post/7227162/spilitwise-low-level-design-by-anonymous-ar05/)
3. [Online Stock Brokerage Sytem]
4. [Uber]
5. [Spotify](https://leetcode.com/discuss/post/7246970/spotify-lld-by-anonymous_user-vdon/)
6. [Amazon]
7. [Swiggy]
8. [Pub Sub System]
9. [Elevator](https://leetcode.com/discuss/post/7241195/elevator-low-level-design-by-anonymous_u-dygc/)
10. [Udacity]
11. [File System]
12. [Stack Overflow](https://leetcode.com/discuss/post/7245381/stack-overflow-lld-by-anonymous_user-7hpx/)
13. [LinkedIn]
14. [Logging Framework](https://leetcode.com/discuss/post/7230862/logging-framework-low-level-design-by-an-b2yl/) 

---

![image.png](https://assets.leetcode.com/users/images/1adef353-b80c-4933-ac7f-3442d2a43e03_1759555504.323851.png)




[W.I.P.]These designs are not fully polished yet — I’m documenting them as part of my learning and practice. I’d appreciate any suggestions or improvements so we can all grow and learn together.Road to GoogleSolid PrinciplesCommonly Used Design Patte