Free System Design

The Internet Is Not a Cloud: What Actually Happens Between Your Click and a Server

The Day My Server Crashed — And the Simple Idea That Fixed It (Load Balancing)

Caching in System Design: How Systems Stay Fast as They Scale

Content Delivery Network (CDN): The Backbone of Fast and Scalable Web Applications 🚀

Proxy Server — The Control Layer Between Clients and Servers

Scalability in System Design: How Systems Grow Without Breaking

SQL vs NoSQL & Database Replication: What Actually Matters

Database Indexes: The Thing That Makes Your Queries Fast

ACID vs BASE: Two Philosophies of Data Consistency

CAP Theorem: Why Your Database Can't Have It All

PACELC: The Theorem That Finishes CAP's Sentence

Why Your Database Transaction Needs a Passport (And Other Distributed Systems Drama)

N-Tier Architecture: Why Your App Probably Shouldn't Live on One Server

Message Brokers Explained: The Traffic Cops of Your Microservices

Message Queues Explained (Without the Headache)

Publish-Subscribe: One Message, Many Listeners

Enterprise Service Bus: The Middleman That Can Become a Bottleneck

Event-Driven Architecture: Let the Events Do the Talking

API Gateway: The Front Door to Your Microservices

REST vs GraphQL vs gRPC: Picking the Right API

CQRS: Why Reads and Writes Shouldn't Share a Lane

Real-Time Web Communication: Long Polling vs WebSockets vs SSE

Rate Limiting: How to Stop Your API From Getting Steamrolled

Service Discovery: How Microservices Find Each Other

SLA vs SLO vs SLI: The Three Letters Every Engineer Should Actually Understand

SSL, TLS, and mTLS: The Padlock Icon, Explained