Duolingo Data Scientist Interview Questions
The questions to prepare for a Duolingo Data Scientist interview. Questions from real interview reports rank first. Updated weekly.
Aggregate user activity by week, then use LAG to compare sessions and watch time versus the prior active week.
DuolingoJoin Duolingo task data to team metadata and calculate weekly completion rates with date grouping and conditional aggregation.
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EarthcamAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
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Benjamin MooreDesign an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.
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Diagnose why conversion fell from 4.8% to 3.1% after a launch by breaking the metric across funnel steps, cohorts, and segments.
DuolingoTests churn modeling approach, feature/label construction, and evaluation for retention interventions.
DuolingoTests statistical communication skills and correct interpretation of experiment results.
DuolingoTests data engineering design for reliability, correctness, and operational handling of late events.
DuolingoTests how you connect analytics and modeling decisions to user learning outcomes.
DuolingoTests causal thinking, metric tradeoff handling, and robust evaluation strategy for product changes.
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