Nextdoor Data Scientist Interview Questions
The questions to prepare for a Nextdoor Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
NextdoorUse CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.
Curefit
Indeed
TikTokOptimize a PostgreSQL reporting query by reducing intermediate rows, using appropriate joins, and calculating monthly performance efficiently.
The Cigna Group
ElemicaFramework for deciding between a growth feature that lifts conversion and a risk feature that reduces fraud losses.
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Assess whether interference between nearby units could bias an operations experiment and how to test for it.
NextdoorDesign an experiment to tell whether a new feature improves true retention, not just short-term usage.
NextdoorHandle rare positive labels in ad fraud detection with the right sampling, loss design, validation, and thresholding strategy.
NextdoorInvestigate why a key KPI moved the wrong way after a product change and separate signal from noise.
NextdoorTests power analysis skills for detecting small effects in safety and moderation experiments.
NextdoorTests your ability to interpret classification metrics and reason about tradeoffs.
Nextdoor