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Building Blocks5

Caching
Databases — SQL vs NoSQL
Message Queues & Async Processing
API Design & Communication
CDNs, Blob Storage & Search

Distributed Patterns4

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Building Blocks5

Caching
Databases — SQL vs NoSQL
Message Queues & Async Processing
API Design & Communication
CDNs, Blob Storage & Search

Distributed Patterns4

Learn System Design Building Blocks

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API Design & Communication

How the pieces of a system talk to each other, and how to pick between REST, GraphQL, gRPC and WebSockets.

11 min readUpdated 2026-09-01system-designapirest