Design a hierarchical forecast for transactions
Company: Stripe
Role: Data Scientist
Category: Machine Learning
Difficulty: medium
Interview Round: Onsite
Overview: Design an end-to-end daily forecast of gross merchandise volume for every country and industry segment over the next 90 days, with segment forecasts that sum exactly to country and global totals. Cover sparse and brand-new segments, a mid-history policy change, rolling-origin validation, and calibrated 90% intervals.
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