Nubank | Senior Software Engineer (Senior) | System Design | Architecture Round

Architecture Design: Mastercard Chargeback Gateway The Scenario When a customer disputes a credit card transaction in the Nubank app, we must process that request and notify the card network (Mastercard). However, Mastercard does not provide a real time API for these disputes. Instead, they require us to upload a formatted Summary File to their SFTP server exactly four times per day. The Task Design a resilient syste...