Onboarding time is a code-quality metric, not an HR one. When a new engineer needs two weeks of tribal knowledge before touching a payment flow, that's not their ramp-up speed: it's missing tests, undocumented contracts, and setup steps living in someone's head. So we watch where the first useful PR stalls, and we fix the repo instead of the person. Your own ramp-up probably stalls somewhere specific too.
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