Pelmorex Data Scientist Interview Questions
The questions to prepare for a Pelmorex Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Calculate total completed session duration per user and return the top three users in PostgreSQL.
Calculate a three-day moving average of active-client revenue using aggregation and SQL window functions.
Explain how to profile, clean, and standardize missing or dirty data before analysis.
Rank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
WaymoTests how a candidate makes a quality-vs-speed trade-off, communicates risk, and owns the outcome.
Tests data-driven decision making, ownership, and change leadership when project metrics indicate the original plan should change.
A framework for prioritizing AI product features based on user value, feasibility, evaluation quality, and trade-offs.
Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.
Investigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.
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