System Design Notes

This repository contains comprehensive notes, diagrams, and resources on system design concepts, architectures, and best practices. It is intended for software engineers, architects, and students preparing for technical interviews or seeking to deepen their understanding of system design.

Contents

• 1. Introduction to High Level Design

  • What is System Design?
  • Monolithic and Microservices Systems
  • Horizontal and Vertical Scaling
  • Availabilty
  • Reliability
  • Consistency
  • CAP Theorem
  • Concurrency and Parallelism
  • Latency and Throughput
  • Idempotency and Statelessness

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• 2. Networking in System Design

  • Networking Basics
  • TCP - IP Model
  • Domain Name System (DNS)
  • Content Delivery Network (CDN)
  • API Communication
  • API Gateway
  • RESTful APIs
  • Virtualization vs Containerization
  • Forward Proxy vs Reverse Proxy

• 3. Load Balancing

  • Load Balancing Basics
  • Types of Load Balancing
  • Load Balancing Algorithms
  • Load Balancer vs Reverse Proxy

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• 4. Databases and Storage Systems

  • Types of Databases
  • Database Replication
  • Database Sharding
  • Database Partitioning
  • Database Normalization
  • Database Denormalization
  • Database Federation
  • Choosing the Right Database

• 5. Caching

  • Introduction to Caching
  • Types of Caching
  • Cache Eviction Policies
  • Cache Write Strategies
  • Cache Invalidation

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• 6. Messaging and Communication

  • Message Queues
  • Publish-Subscribe Model
  • Event-Driven Architecture

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High Level Designs

Topic	Description
A Real World System Architecture	A comprehensive overview of a real-world system architecture, covering components, interactions, and design decisions.
OTP Service Design	A detailed design for an OTP service, including components, data flow, and scalability considerations.
SignUp Service Design	A comprehensive design for a user sign-up system covering user data management, validation, and security aspects.
URL Shortener Design	An architectural design for a URL shortening service, including database schema, API design, and scalability strategies.
Design Consistent Hashing	An explanation of consistent hashing, its benefits, and how to implement it in distributed systems for load balancing and fault tolerance.
Design a Unique ID Generator	A design for a unique ID generator service, covering algorithms, scalability, and fault tolerance.

The notes are organized by topic and architecture type, with supporting diagrams for visual reference. Each section provides definitions, objectives, advantages, disadvantages, and practical considerations for system design.

How to Use

• Browse the markdown files for structured notes and explanations.
• Refer to the images folder for architecture diagrams.
• Use the references to explore further reading and deepen your understanding.

Sources & References

The content in this repository is curated from multiple reputable sources, including:

• GeeksforGeeks System Design
• Gaurav Sen YouTube Channel
• Striver's System Design Tracker
• System Design Primer
• roadmap.sh System Design
• Various technical blogs, documentation, and open-source resources

License

This repository is for educational purposes. Please refer to the original sources for copyright and licensing information.

For suggestions or contributions, feel free to open an issue or submit a pull request.