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Updated weekly · Last refresh Oct 17

Ion Group Data Scientist Interview Questions

The questions to prepare for a Ion Group Data Scientist interview. Questions from real interview reports rank first. Updated daily.

38questions
~6htotal time
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1
SQL & Data ManipulationStart here. 9 questions + 1 drill · ~89 min
2
Statistics & Probability4 questions · ~35 min
Probability of Sum NineEasy

Compute the probability that two fair six-sided dice add up to 9 by counting favorable outcomes over total outcomes.

DistributionsExpected ValueConditional ProbabilityIon Group
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3
Machine Learning5 questions · ~44 min
Bias Variance and RegularizationMedium

Explain the bias-variance tradeoff mathematically and how L1 and L2 regularization change model complexity and weights.

Bias-Variance TradeoffRegularizationSupervised LearningIon Group
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4
Metrics3 questions · ~26 min
First Checks for Metric DropsEasy

Outline the first checks to diagnose a sudden drop in a core product metric, starting with data quality, scope, and decomposition.

Lagging IndicatorsLeading IndicatorsDiagnosisIon Group
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5
Behavioral & Leadership9 questions · ~79 min
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6
More topics8 questions · ~70 min
Design Test for New FeatureMedium

Design an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.

experiment designfeature evaluationA/B TestingIon Group
Find Friction in Member JourneyMedium

Use product and behavioral data to find the highest-impact friction points across the member journey and prioritize where to act first.

Jobs to Be DoneUser SegmentsPain PointsIon Group
Data Cleaning and PreprocessingMedium

Evaluates your approach to preparing real-world data for modeling and analysis.

data cleaningIon Group
Database Structure for Price MonitoringHard

Evaluates system design thinking for data modeling in a multi-source price monitoring product.

system designIon Group
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The finish line: interview-readyComplete all 38 questions plus 1 hands-on drill to finish this plan.