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System design (HLD, LLD and architecture)

High-level design (HLD) and low-level design (LLD) are separate tracks: HLD covers estimation, building blocks and case studies of whole systems; LLD covers classes, patterns and object-oriented case studies with code.

12 tracks

System Design (High-Level Design)

Planned outline: 30 modules, starting with “Start here: how system design works”. Coming soon

Low-Level Design (Object-Oriented Design)

Planned outline: 17 modules, starting with “LLD rounds and a repeatable answer method”. Coming soon

Design Patterns (GoF and modern)

Planned outline: 11 modules, starting with “Why patterns, and when not to use them”. Coming soon

Concurrency & Multithreading

Planned outline: 14 modules, starting with “Foundations: what concurrency is and why it is hard”. Coming soon

API Design (REST, gRPC, GraphQL, Webhooks)

Planned outline: 19 modules, starting with “Foundations: APIs as contracts”. Coming soon

Distributed Systems

Planned outline: 17 modules, starting with “Foundations: models, failures and messages”. Coming soon

Software Architecture & Microservices

Planned outline: 11 modules, starting with “Foundations: what architecture is and how decisions get made”. Coming soon

AI & LLM System Design

Planned outline: 13 modules, starting with “Start here: how AI system design works”. Coming soon

Front-end System Design

Planned outline: 16 modules, starting with “Start here: a method for front-end design”. Coming soon

Mobile System Design

Planned outline: 13 modules, starting with “Start here: the mobile system design round”. Coming soon

Machine Learning System Design

Planned outline: 12 modules, starting with “Start here: how ML system design works”. Coming soon

Systems Papers & Postmortems

Planned outline: 14 modules, starting with “Reading primary sources: papers, postmortems and toy reproductions”.