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Difficulty
6 resources
Lab · Intermediate · 40 min
Trigger your server events with bad data and confirm every one is rejected.
Lab · Intermediate · 40 min
Find why two reports disagree on the same metric.
Lab · Intermediate · 30 min
Given a module with a runtime bug that loose types allowed, tighten the types until the compiler finds it.
Lab · Intermediate · 30 min
Measure a page's JavaScript, move logic to the server, and measure again.
Lab · Intermediate · 45 min
Plant a bug in a codebase, then use Claude Code to find and fix it from a report, with a regression test.
Lab · Intermediate · 1h
Attack a support agent with adversarial inputs and confirm each is refused or handed over.