Diagnose a One-Day Drop in Successful Deliveries
Company: DoorDash
Role: Data Scientist
Category: Analytics & Experimentation
Difficulty: medium
Interview Round: Technical Screen
Overview: Investigate an absolute one-day drop in successful deliveries without mistaking a count change for a rate change. Build a funnel decomposition, rank customer, merchant, courier, external, and data-quality hypotheses, and measure whether one merchant explains the market decline.