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Behavioral and leadership · Coding · Practical engineering · System design
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Design a chargeback system that allows customers to report fraudulent charges. The system should optimistically approve chargeback requests and then batch process them when…
Companies: Nubank
Last reported Oct 2026
Design a system that efficiently retrieves top-k items (songs, videos, hashtags, etc.) based on user activity or engagement metrics within specified time windows. The system…
Companies: Nubank, Amazon, Atlassian, Bloomberg +10
Last reported Oct 2026
Implement a function to calculate capital gains tax based on a set of predefined rules and formulas. The solution should correctly apply the relevant tax…
Companies: Nubank
Last reported Aug 2026
Design a system that receives chargeback requests via an API, aggregates them into files, and transmits those files to card brand servers, while handling constraints…
Companies: Nubank
Last reported Aug 2026
Given a JSON file parser for a finance-related calculator, identify and fix existing bugs then implement new features such as additional data types and modified…
Companies: Nubank
Last reported Jul 2026
Describe the code review process you follow in your projects, including the tools, steps, and criteria you use to ensure code quality and team collaboration.
Companies: Nubank, Teamviewer
Last reported Jul 2026
Companies: Nubank, CrowdStrike, Meta, Monzo +3
Last reported Jul 2026
Design a payment network system that processes credit card transactions between merchants and issuing banks at scale. The system should handle transaction routing, bank…
Companies: Nubank, Databricks, Visa, Walmart
Last reported Apr 2026
Review code that processes payment methods based on business rules, identifying logical issues and implementing new requirements. Analyze program output for given inputs and…
Companies: Nubank, Capital One, PayPal
Last reported Apr 2026
Design a real-time commenting system that allows users to view and post comments instantly while watching live videos or browsing posts across Meta platforms. The…
Companies: Nubank, Amazon, Bloomberg, Figma +3
Last reported Apr 2026