Learn the trade-off by paying for it
41 interactive drills where the concept is the game mechanic. Partition a cluster and choose what to sacrifice. Drain a backlog without melting the database. Rename a column on 900 million rows with a rollback that works at every step.
In development
What it does
One drill at the end of every module
Scored on the trade-off you made, not the answer you typed
Failure states are the teaching: the round shows you what broke
Free, like the rest of the curriculum
41 drills, one per module
Each one puts you inside the trade-off rather than describing it. Fail states are the teaching: the round shows you what your choice cost.
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Tracks, from the network to the negotiation
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Modules, each ending in a drill
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Systems worked end to end
The rest of it
The Curriculum — Free
Every layer, from a packet to a payment system
Question Bank — Pro
The questions, and what a strong answer contains
Application Assistant — Pro
Drafts the application. Never sends it without you.
Interview Tracker — Pro
A pipeline built for loops, not for a spreadsheet
Interview Calendar — Pro
Preparation scheduled against the round it is for
Community — Pro
Design reviews with people who will argue with you
