WEX Data Scientist Interview Questions
The questions to prepare for a WEX Data Scientist interview. Questions from real interview reports rank first. Updated weekly.
Calculate 30-day rolling average transaction volume for WEX Fleet One accounts using aggregation and window functions.
WEXExplain practical SQL techniques for handling NULLs and missing values in product analysis without biasing metrics.
WEXUse joins, CASE WHEN, and date filtering to compare outcome rates before and after a decision.
HarbourVest PartnersCompute per-vehicle daily autonomous vs manual seconds from state-change logs using LEAD and conditional aggregation.
Define a success metric for a new feature that captures real user value, not just raw usage.
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Design an A/B test for a new checkout installment-flow feature, including metrics, power, guardrails, and a disciplined ship decision.
WEXInvestigate a 15% engagement decline by decomposing the metric, isolating root causes, and proposing actions.
WEXExplain how to evaluate whether an A/B test result is statistically significant and how to interpret the result.
WEXChoose useful features for a supervised model and avoid overfitting, leakage, and unstable predictors.
WEXTests practical deployment experience including monitoring, reliability, and iteration.
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