Brain Interview Questions
The questions to prepare for Brain interviews, across all roles. Questions from real interview reports rank first. Updated weekly.
Reverse a singly linked list in-place using iterative pointer manipulation.
BrainRetrieve the 10 highest-value sales using PostgreSQL ORDER BY and LIMIT.
BrainAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreUse ROW_NUMBER() to keep the earliest created_at 'Repl created' per entity and return out-of-order duplicates to delete.
Replit
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Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
BrainExplain how you used a KPI and supporting metrics to diagnose a product issue and make a concrete product decision.
BrainA framework for connecting user needs to business goals, then making product decisions with clear trade-offs and measurable outcomes.
BrainDescribe how you handled a tough trade-off between shipping fast, maintaining quality, and reducing scope.
BrainA practical approach for tracking industry trends, competitor moves, and market changes in a way that informs strategy decisions.
BrainApproach for handling missing data in an ML data pipeline, including validation, imputation, and safe downstream consumption.
Brain