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System Design Quest
Practise system design interviews as a game. Training chapters build the knowledge; quests are katas where you design one product end to end.
No sign-up. Your optional profile and your progress stay in your browser, and nothing you type is sent anywhere. Points come from right answers only; a miss costs nothing.
System Design Quest needs JavaScript. The code is on GitHub.
Spotted a wrong answer?
Report it on GitHub ↗. The code and the challenges are open source, so you can see how every answer is checked.