System Design
Design systems that don’t break.
Start simple. See what breaks as the system grows, then learn how the architecture changes.
About 2.5 hoursFull roadmap
8core studies
- 01
Start with a real product
See the simplest design that meets the first requirements.
- 02
Find the breaking point
See what fails as traffic, data, or latency grows.
- 03
Reuse the reasoning
Apply the same decisions to a different system.
Start here
Architecture Studies
8 available · 9 planned
01
foundation19 min read
URL Shortener System
Popular links create read spikes, analytics writes slow redirects, custom aliases collide, and abusive link creation needs controls.
02
intermediate23 min read
Instagram Likes System
Users retry taps, celebrity posts become hot keys, feed and profile counters need fast reads, and downstream projections drift.
system-designdistributed-counterssocial-systems
03
intermediate28 min read
WhatsApp-Style Messaging System
Recipients are offline, mobile connections drop, users have multiple devices, groups fan out, and retries can duplicate messages.
system-designreal-time-systemsmessaging
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