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Nubank Interview Experiences
3935 interview stories from candidates at 857 companies: how each round went, what was asked and how it ended. Every company page links to practice questions in the same style.
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- Chargeback Ingestion and a Database Read BottleneckNubank · Software Engineer · Senior+ · Onsite · Sep 2026Rejected
Problem: Design a Chargeback Ingestion System Design a system that processes card chargeback/dispute transactions. The system receives chargeback-related transaction events, validates and deduplicates them, tracks their processing state, persists them, and eventually exports eligible transactions into CSV files. These CSV files must be sent to Mastercard via FTP/SFTP. The difficulty felt all righ…