Five minutes a lesson.
Each lesson boiled down to swipeable cards: the key ideas, the numbers to remember, one trade-off table, the classic mistakes and what to say when the interviewer asks. Flip a whole world the night before. Save it offline and it works on the flight.
read the guide →75 lessons · 696 cards · cards you mark "again" join your Daily standup- World 00
Foundations
8 lessons · 76 cards · ~40 minPart 1 · System Design FundamentalsPart 2 · Infrastructure Building BlocksPart 3 · Back-of-the-Envelope EstimationPart 4 · Networking Fundamentals for System DesignPart 5 · Operating System Concepts for System DesignPart 6 · System Design Terminology & TheoryPart 7 · API Design for System DesignPart 8 · Databases in Depth - World 01
Data at Scale
6 lessons · 53 cards · ~30 min - World 02
Failure-First Design
6 lessons · 53 cards · ~30 min - World 03
Messaging and Async Processing
6 lessons · 52 cards · ~30 min - World 04
Caching
6 lessons · 52 cards · ~30 min - World 05
Consistency and Coordination
6 lessons · 52 cards · ~30 min - World 06
Real-Time Delivery
6 lessons · 57 cards · ~30 min - World 07
Designing a Search System
6 lessons · 59 cards · ~30 min - World 08
Designing an Analytics Pipeline
7 lessons · 70 cards · ~35 minDay 1 · Event Ingestion at ScaleDay 2 · Streaming vs Batch ProcessingDay 3 · Data Modeling for AnalyticsDay 4 · Late-Arriving Data and CorrectnessDay 5 · Query Layer and OptimizationDay 6 · Counting at Scale: Bloom Filters, HyperLogLog, Count-Min Sketch and Top-KBoss · Real-Time Analytics for Video Streaming Platform - World 09
Multi-tenancy and Security
6 lessons · 55 cards · ~30 min - World 10
Production Readiness and Operational Excellence
6 lessons · 58 cards · ~30 min - World 11
Designing AI Systems
6 lessons · 59 cards · ~30 min