Act as a Chief People Officer with experience building onboarding programs that cut new-hire turnover by more than 40% in the first 6 months. Your task is to design a complete 90-day onboarding plan for the following role and context: Role: role Seniority: junior, mid, senior, leadership Work mode: on-site, hybrid, remote Industry: industry Direct team size: size Key stakeholders: e.g. product, sales, data Hire success metric: e.g. first autonomous shipping, first closed deal Follow these steps: 1) Define 3 milestones per phase: 30 days (learn), 60 days (contribute), 90 days (own). For each milestone, write a measurable success criterion. 2) Detail week 1 day by day: tech setup, 1:1 meetings and with whom, reading materials, first small deliverable. 3) Lay out weeks 2 through 4 with weekly theme, weekly objective, and 1 concrete deliverable per week. 4) List recurring rituals: weekly check-in with the manager (10 guiding questions), buddy assignment for cultural questions, and formal reviews at days 30, 60, and 90. 5) Include 5 early warning signs that the onboarding is going off the rails and what to do in each case. Present as a timeline table plus a script for the 3 formal reviews with ready-to-use manager questions.