Duolingo Interview Questions
The questions to prepare for Duolingo interviews, across all roles. 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.
DuolingoRank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
WaymoFind the longest substring with all unique characters using a sliding window.
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Explain how you used a KPI and supporting metrics to diagnose a product issue and make a concrete product decision.
DuolingoExplain which project management tools you use most effectively and why, including how they support execution and stakeholder alignment.
DuolingoExplain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
DuolingoA framework for connecting user needs to business goals, then making product decisions with clear trade-offs and measurable outcomes.
DuolingoIdentify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.
DuolingoExplain a sales strategy you built and executed, including segmentation, objection handling, and how it drove account growth.
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