System Design, Vishwakarma A., 2026

System Design, Vishwakarma A., 2026.

   This book takes a structured, practical journey through the foundations and applications of system design. It begins by establishing core principles such as scalability, availability, consistency, performance, and trade-offs, and gradually builds toward designing complete, real-world systems. Each chapter introduces essential concepts and then applies them to concrete problems, ranging from databases, caching, APIs, and messaging systems to full-scale designs of real-time chat applications, URL shorteners, and notification platforms. The goal is not just to show what to build, but how to think when designing systems under real-world constraints.




Complexity of distributed systems.
Modern applications rarely run on a single machine. Instead, they are distributed across multiple servers, often spanning data centers across the globe. While distribution improves scalability and availability, it also introduces complexities such as data synchronization, network failures, and ensuring consistency across nodes.

Real-world example: When you send a message on WhatsApp, it must travel through multiple servers to reach the recipient, all while ensuring encryption and message integrity. A network failure or server outage at any point in this journey could disrupt message delivery. WhatsApp mitigates this by using multiple data replicas and failover mechanisms to ensure messages are not lost.

Contents.
1. Introduction to System Design.
2. Scalability and Performance Basics.
3. Database Design for Scalable Systems.
4. Load Balancing and Traffic Distribution.
5. Message Queues and Event-driven Architecture.
6. API Design and Microservices Architecture.
7. Caching.
8. Security in System Design.
9. Designing a Real-time Chat System.
10. Designing a URL Shortener.
11. Designing a Notification System.
12. Building Scalable Systems in Production Final Thoughts.
Index.



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