Low Level Design (LLD) Notes - System Design Principles & Patterns

Low Level Design (LLD) Notes

This resource provides comprehensive handwritten notes on Low Level Design (LLD) concepts, crucial for backend developers and software engineers.

Key Topics Covered:

• SOLID Principles:
  • Single Responsibility Principle (SRP)
  • Open/Closed Principle (OCP)
  • Liskov Substitution Principle (LSP)
  • Interface Segregation Principle (ISP)
  • Dependency Inversion Principle (DIP)
• Design Patterns:
  • Factory Method
  • Abstract Factory
  • Builder
  • Prototype
  • Singleton
  • Adapter
  • Bridge
  • Composite
  • Decorator
  • Facade
  • Flyweight
  • Proxy
  • Chain of Responsibility
  • Command
  • Interpreter
  • Iterator
  • Mediator
  • Memento
  • Observer
  • State
  • Strategy
  • Template Method
  • Visitor
• UML (Unified Modeling Language):
  • Class Diagrams
  • Sequence Diagrams
  • Use Case Diagrams
  • Activity Diagrams
• Real-World LLD Examples:
  • Zomato: Designing a food delivery platform.
  • WhatsApp: System design for a messaging application.
  • Payment System: Architecture for processing financial transactions.
  • Parking Lot: Design considerations for a parking management system.
  • Elevator: Logic and design for elevator systems.
  • Online Shopping: Key components of an e-commerce platform.
  • URL Shortener: Designing a service to shorten long URLs.
  • Rate Limiter: Implementing mechanisms to control request rates.
  • Typeahead/Autocomplete: System design for predictive text input.
  • Web Crawler: Building a system to index web pages.
  • Notification Service: Designing a system to send notifications.
  • Metrics Scraper: Developing a tool to collect system metrics.
  • Design a Message Queue: Principles for building a message queuing system.
  • Design a Distributed Cache: Strategies for distributed caching.
  • Design a Video Streaming Service: Architecture for streaming video content.
  • Design a Social Media Feed: Building a personalized content feed.
  • Design a Search Engine: Core components of a search engine.
  • Design a Recommendation System: Algorithms and architecture for recommendations.
  • Design a Ride-Sharing App: System design for services like Uber/Lyft.
  • Design a Chat Application: Similar to WhatsApp, focusing on real-time communication.
  • Design a Stock Exchange System: High-frequency trading and order matching.
  • Design a Tiny URL Service: Similar to URL Shortener.
  • Design a Pastebin Service: Storing and sharing text snippets.
  • Design a Distributed ID Generator: Generating unique IDs across distributed systems.
  • Design a Metrics Service: Collecting and aggregating system metrics.
  • Design a Notification Service: Sending alerts and updates.
  • Design a Web Crawler: Indexing the internet.
  • Design a Video Streaming Service: Delivering video content efficiently.
  • Design a Social Media Feed: Curating and displaying user content.
  • Design a Search Engine: Enabling information retrieval.
  • Design a Recommendation System: Personalizing user experiences.
  • Design a Ride-Sharing App: Connecting drivers and riders.
  • Design a Chat Application: Real-time messaging.
  • Design a Stock Exchange System: Facilitating financial trading.

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