Interactive Simulators Enabled

System Design Guides

Ace your system design interviews by reviewing curated engineering blueprints and practicing mock scenarios with guided AI feedback.

Challenge TopicFormat Options

URL Shortener

Scale & Latency

Dropbox Cloud Storage

Distributed Systems

Data Modeling

Core Concepts

Sharding

Core Concepts

Caching

Core Concepts

Consistent Hashing

Core Concepts

CAP Theorem

Distributed Systems

Numbers to Know

Core Concepts

API Design

Core Concepts

Database Indexing

Storage & Queries