Design a chargeback ingestion and export system
Company: Nubank
Role: Software Engineer
Category: System Design
Difficulty: easy
Interview Round: Onsite
Overview: This question evaluates system design skills around reliable ingestion and scheduled export of financial transaction records, specifically testing competencies in data modeling, batching strategies, idempotency and retry semantics, durable storage, error handling, monitoring, and security/compliance for payment and PII data.