System Design From Scratch

This repository is a structured guide to learning System Design from the ground up, with organized notes, examples, and practical references. It covers both High-Level Design (HLD) and Low-Level Design (LLD) concepts, focusing on clarity, scalability, and real-world relevance.

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Overview

System Design is the foundation of building scalable, reliable, and efficient software systems. This repository organizes key topics into sections — from the basics of scalability to real-world design examples like Netflix, Twitter, and chat-apps.

Each topic is concise, complete, and designed to be beginner-friendly yet industry-relevant.

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Repository Structure

system-design-from-scratch/
├── 00-roadmap/              → Learning path and key resources
├── 01-basics/               → Foundational concepts (scalability, caching, CAP theorem, etc.)
├── 02-components/           → Core system components (API gateway, CDN, proxies, etc.)
├── 03-design-patterns/      → Architectural patterns (Microservices, CQRS, Event-driven, etc.)
├── 04-high-level-designs/   → Real-world system designs (Twitter, Uber, YouTube, etc.)
├── 05-low-level-designs/    → OOP design, SOLID principles, and LLD examples
├── 06-cheatsheets/          → Quick references, FAQs, and interview prep
├── 07-visuals/              → Diagrams, mind maps, and infographics
└── CONTRIBUTING.md          → Contribution guidelines

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Learning Approach

1. Start with 00-roadmap/ for a guided learning sequence.
2. Move to 01-basics/ and 02-components/ to build your fundamentals.
3. Study 03-design-patterns/ to understand how large-scale systems are structured.
4. Explore 04-high-level-designs/ for real-world architectures.
5. Review 05-low-level-designs/ for implementation-level understanding.
6. Use 06-cheatsheets/ and 07-visuals/ for revision and quick recall.

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Key Topics Covered

• Scalability, Load Balancing, and Caching
• Databases, Sharding, and Replication
• CAP Theorem, Availability vs Consistency
• API Gateways, Message Queues, CDNs, and Proxies
• Microservices, CQRS, Pub/Sub, Event-Driven Design
• High-Level System Design Case Studies
• Low-Level Design and SOLID Principles
• Interview Preparation and Cheatsheets

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Contributions

Contributions are welcome. If you’d like to add, correct, or improve content:

• Fork the repo
• Create a new branch
• Commit your changes
• Open a Pull Request

Refer to CONTRIBUTING.md for details.

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Goal

To build a complete, open, and concise System Design resource that helps learners and engineers understand not just what to design, but how and why systems work at scale.