Welcome to the System Design Documentation.
This guide is designed to help you understand system design principles, learn from real-world examples, and master both High-Level Design (HLD) and Low-Level Design (LLD) patterns.

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Why System Design?

System design is a core skill for software engineers, especially for interviews, architecture planning, and building scalable, reliable systems.

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What Will You Learn?

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Topics

1. Fundamentals

   • What is system design?
   • Types of systems: monolith vs microservices
   • Scalability, availability, reliability
   • CAP Theorem
   • Consistency models

2. Key Components

   • Load Balancers
   • Caching
   • Database (SQL, NoSQL)
   • Message Queues & Event Streaming
   • CDN & Edge Computing
   • API Gateways & Service Mesh
   • Authentication & Authorization

3. Design Principles

   • Designing for scale
   • Fault tolerance & disaster recovery
   • Observability & Monitoring
   • Cost optimization

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HLD Case Studies

1. Design a URL Shortener (like Bit.ly)
2. Design Instagram
3. Design WhatsApp
4. Design Netflix Streaming
5. Design Food Delivery App (Zomato/Swiggy)
6. Design E-commerce Platform (Amazon Flipkart-like)
7. Design Ride-Sharing Service (Uber/Ola)
8. Design Parking Management System
9. Design Online Code Execution Platform (LeetCode/Codeforces)

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LLD Case Studies

1. Library Management System
2. ATM Machine Workflow
3. Parking Lot System
4. Elevator Control System
5. Chess Game
6. Splitwise Clone
7. Logger Utility
8. Inventory Management

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Guided Paths

Inspired by System Design Primer.

Path 1: Beginners

• Start with basics → Learn key components → Do small case studies

Path 2: Intermediate

• Learn about scaling and distributed systems
• Practice HLD + LLD combos

Path 3: Advanced

• Deep dive into cloud-native architecture, event-driven systems, and advanced caching strategies

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Interview Preparation

1. Patterns to Master

   • Sharding
   • Replication
   • Leader election
   • Rate limiting

2. Mock Interview Tips

   • Clarify requirements first
   • Draw block diagrams
   • Mention trade-offs

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