Basics

1. 1System Design 101 — HLD vs LLDp. 1
2. 2Requirements — Functional vs Non-Functionalp. 2

High Level Design

1. 3High Level Design (HLD): The 30,000-Foot Viewp. 3
2. 4Reading & Drawing the HLD Diagramp. 4

Architectural Styles

1. 5Monolith vs Microservices: The Great Architecture Showdownp. 5
2. 6Event-Driven Architecture: Stop Asking, Start Reactingp. 6
3. 7Pub/Sub & Serverless: Decouple Everything, Own Nothingp. 7
4. 8Stateless vs Stateful: Where Does the Memory Live?p. 8

Scalability

1. 9Scalability: What It Is & How You Growp. 9
2. 10Designing for Scale & Killing Bottlenecksp. 10

Databases

1. 11Designing Databases & The SQL vs NoSQL Showdownp. 11
2. 12Storage Systems: Block, Object & Filep. 12
3. 13Normalization, Denormalization & Query Optimizationp. 13
4. 14Replication: Copies That Keep You Alivep. 14
5. 15Sharding, Partitioning & Redisp. 15

Consistency, Availability & Reliability

1. 16Availability & Achieving High Availabilityp. 16
2. 17Consistency Patterns & the CAP Theoremp. 17
3. 18Reliability, Fault Tolerance & Maintainabilityp. 18

Load Balancing

1. 19Load Balancers: The Maitre d' of the Internetp. 19
2. 20L4 vs L7, Algorithms & the Stateless Questionp. 20
3. 21Concurrency, Failover & Consistent Hashingp. 21

Latency, Throughput & Caching

1. 22Latency vs Throughput — The Speed You Feel vs The Volume You Movep. 22
2. 23Caching — Buying Speed With Memoryp. 23
3. 24Distributed Caches, CDNs & the Edge — Speed at Planet Scalep. 24

API Gateway, Queues & Rate Limiting

1. 25API Gateway & Message Queuesp. 25
2. 26Rate Limiting & Its Algorithmsp. 26

Protocols, CDN, Proxies & WebSockets

1. 27Talking Over the Wire: HTTP, TCP/UDP & gRPCp. 27
2. 28DNS: The Internet's Phonebook (and its Sticky Cache)p. 28
3. 29CDNs & Proxies: Bringing Content Closer, Hiding Serversp. 29
4. 30Servers, Polling & WebSockets: Pushing Data in Real Timep. 30

Event-Driven Architecture

1. 31Event-Driven Architecture: The Big Ideap. 31
2. 32Event Sourcing, Streaming & Restoring Statep. 32
3. 33Errors, Event-Driven APIs & Untangling the Buzzwordsp. 33

Testing

1. 34Testing the Pyramid: Unit & Integrationp. 34
2. 35Load, Stress & the CI/CD Conveyor Beltp. 35

Security

1. 36Security I — Defense in Depth, AuthN/AuthZ & TLSp. 36
2. 37Security II — Secure SDLC, Backups & Disaster Recoveryp. 37

Distributed Systems

1. 38Distributed Systems: The Big Picture (and How They Break)p. 38
2. 39Agreement, Visibility & Trust: Making the Swarm Behavep. 39

Cost & Performance

1. 40Cost & Performance: Spending Smart, Running Fastp. 40

Low Level Design — Core

1. 41What is LLD? (and how it differs from HLD)p. 41
2. 42OOP, Modularity & Interfacesp. 42

Design Principles

1. 43Design Principles: SOLID, DRY, KISS & YAGNIp. 43

UML & Design Patterns

1. 44UML Diagrams — Drawing the Blueprint Before You Pour Concretep. 44
2. 45Design Patterns — The 23 Reusable Moves Every Senior Engineer Has Muscle-Memorizedp. 45

Design Questions

1. 46Design a URL Shortenerp. 46
2. 47Design a Rate Limiterp. 47
3. 48Design a News Feedp. 48
4. 49Design a Chat Systemp. 49