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15 Aug, 2026

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System Design and Design Patterns

System Design and Design Patterns

System Design and Design Patterns

Overview

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1.1Web Push Notifications

2.1Cross Origin Resource Sharing (CORS) Policy 2.2Cross-Site Request Forgery (CSRF)

3.1Introduction to Observability & Reliability Engineering 3.2The Three Pillars of Observability

4.1Evolution of the Web & HTTP

5.1Payment System 5.2Delivery Framework for the system design interview

6.1Fan-Out and Fan-In 6.2Batching in System Design

8.1What is System Design?8.2Design Principles and Key Characteristics in System Design 8.3Throughput 8.4Availability 8.5Monolith vs Microservices

9.1Why Browsers Need Multiple Storage Mechanisms 9.2Cookies 9.3Web Storage APIs: Local Storage and Session Storage 9.4Indexed DB: The Browser As a Database 9.5Web Versions

10.1Understanding Browser Extensions 10.2Working of Browser Extensions

11.1Introduction to Data Encoding, Hashing, and Cryptography 11.2Data Encoding 11.3Hashing Fundamentals 11.4Cryptography 11.5Diffie-Hellman Key Exchange

12.1Traditional Deployment 12.2AWS Era 12.3Virtualization 12.4Containerization

13.1Telnet 13.2SSH

14.1Webhooks 14.2Polling 14.3WebSocket 14.4Server-Sent Events (SSE)14.5Bloom Filters 14.6WebRTC

15.1Classic Authentication 15.2The Token Revolution: Moving Toward Stateless Systems 15.3The Era of Federation SSO and OAuth 15.4HTTP Basic Authentication (Early Web)15.5HTTP Digest Authentication 15.6Cookie-Based Session Authentication 15.7Token-Based Authentication 15.8Delegated Authentication 15.9Proof Key for Code Exchange (PKCE)

16.11 Creational Design Patterns 16.22 Structural Design Patterns 16.33 Behavioral Design Patterns

17.11 Adapter (Structural) Design Pattern 17.22 Bridge (Structural) Design Pattern 17.33 Composite (Structural) Design Pattern 17.44 Decorator (Structural) Design Pattern 17.55 Facade (Structural) Design Pattern 17.66 Flyweight (Structural) Design Pattern 17.77 Proxy (Structural) Design Pattern

18.11 Chain of Responsibility (Behavioral) Design Pattern 18.22 Command (Behavioral) Design Pattern 18.33 Iterator (Behavioral) Design Pattern 18.44 Mediator (Behavioral) Design Pattern 18.55 Memento (Behavioral) Design Pattern 18.66 Observer (Behavioral) Design Pattern 18.77 State (Behavioral) Design Pattern 18.88 Strategy (Behavioral) Design Pattern 18.99 Template Method (Behavioral) Design Pattern 18.1010 Visitor (Behavioral) Design Pattern

19.1Understanding Requirements 19.2Back of the Envelope Estimation 19.3Why High-Level Design (HLD) Is About Web and Mobile Apps, Not Traditional Offline Software 19.4Scale from Zero to Millions of Users

20.1Network Protocols 20.2Networking Basics 20.3Remote Procedure Call (RPC)

21.1Scalability Fundamentals 21.2Load Balancing 21.3Load Balancing Algorithms 21.4Proxy 21.5Consistent Hashing 21.6API Gateway

22.1Introduction to APIs in System Design 22.2API Architectural Styles 22.3API Architecture Layers 22.4Core Principles of API Design 22.5Idempotency 22.6Entity Tag 22.7REST API Design

23.1Databases 23.2Database Replication 23.3CAP Theorem 23.4Database Partitioning 23.5Sharding 23.6Database Indexing 23.7SQL vs NoSQL Databases 23.8Transactions 23.9ORM (Object-Relational Mapping)23.10Repository Pattern

24.1Monolithic Architecture 24.2Microservices Architecture

25.1Types of Caching 25.2Where to Cache 25.3Cache Eviction Policies 25.4Common Cache Issues

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