Voodoo Interview Questions
The questions to prepare for Voodoo interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Define a success metric for a new feature that captures real user value, not just raw usage.
Calculate each active user's rolling seven-day revenue average with daily aggregation and window functions.
Explain a controlled month-end close, including reconciliations, accruals, variance analysis, review, and GAAP financial statement completion.
Explain practical ways to train and evaluate a classifier when the target classes are highly imbalanced.
Explain statistical significance, p-values, practical importance, and uncertainty to a non-technical stakeholder.
Identify the major pitfalls in mobile game A/B tests and explain how to design around them before making a ship decision.
Explain your experience selecting and interpreting model evaluation metrics across machine learning tasks.
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Approach a mixed interview round while summarizing completed activity with a CTE, aggregation, and left join.
WiseJoin two tables and derive palindrome, reversed-substring, and character-frequency results with PostgreSQL.
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