Design and evaluate a fraud detection strategy

Company: PayPal

Role: Data Scientist

Category: Analytics & Experimentation

Difficulty: easy

Interview Round: Technical Screen

Quick Answer: This question evaluates fraud domain knowledge, quantitative model evaluation, metrics and diagnostic design, operational strategy formulation, segmentation, and monitoring competencies—covering topics like fraud types, account takeover mechanics, labeling distinctions, thresholding trade-offs, and combined rules/model/manual-review pipelines.