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Updated weekly · Last refresh Aug 30

Evans & Chambers Technology Data Scientist Interview Questions

The questions to prepare for a Evans & Chambers Technology Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

21questions
~3htotal time
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1
Machine LearningStart here. 4 questions · ~37 min
Bias-Variance Tradeoff in PracticeMedium

Explain the bias-variance tradeoff and how it guides model choice, regularization, and generalization performance.

Cross-ValidationBias-Variance TradeoffRegularizationEvans & Chambers Technology
Prevent Overfitting in ML ModelsEasy

Explain how to reduce overfitting using regularization, validation, and model selection.

Cross-ValidationBias-Variance TradeoffRegularizationEvans & Chambers Technology
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2
A/B Testing & Experimentation4 questions · ~37 min
Measure Onboarding Message ImpactMedium

Design an A/B test to determine whether a new onboarding message changes downstream user behavior without harming key guardrails.

ExperimentationConversion RateA/B TestingEvans & Chambers Technology
Mobile Flag Rollout Experiment AnalysisMedium

Design and analyze a mobile feature-flag rollout with a pre-registered primary metric, guardrails, and a clear ship rule.

Rollback PlanExperimentationGuardrail MetricsEvans & Chambers Technology
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3
Product Sense4 questions · ~37 min
Balance User Needs and GoalsMedium

Explain how you balanced user needs with business goals in a product decision, including trade-offs and outcomes.

Feature PrioritizationUser NeedsValue PropositionEvans & Chambers Technology
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4
Behavioral & Leadership6 questions · ~55 min
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5
More topics3 questions · ~27 min
7-Day Rolling Active UsersMedium
Practice

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsEvans & Chambers Technology
Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosisEvans & Chambers Technology
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice

Calculate the monthly spending trends for customers using window functions and joins.

Evans & Chambers Technology

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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min
Customer Transaction Running TotalsEasy
Practice
Practice drill

Calculate each customer's cumulative transaction amount over time using a CTE and window function.

Window FunctionsDate FunctionsRunning TotalsBanco SantanderAnzBank Of Tokyo-Mitsubishi UFJ
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