Stripe OA | SWE Intern 2026 | HackerRank (60 min, 1 Problem)

Problem - Merchant Fraud Detection System Background Stripe processes billions of dollars in transactions every day. A key part of the system is detecting and preventing fraudulent activity. This problem simulates a simplified fraud detection system that processes a stream of events in real time. Merchants are grouped by Merchant Category Code (MCC), and each MCC has a fraud threshold that determines when a merchant is considered fraudulent. This problem has three parts. Each part builds on the previous one. ...