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BT Group Data Scientist Interview Questions

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

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1
A/B Testing & ExperimentationStart here. 4 questions · ~35 min
Avoid Pitfalls in Online ExperimentsHard

Explain common online experimentation pitfalls and how to design, analyze, and decide in ways that avoid false wins.

Network InterferenceNovelty EffectSample Ratio MismatchBBT Group
Explain Experiment ResultsMedium

Tests communication of experiment outcomes and decision rationale to non-technical partners.

stakeholder communicationBBT Group
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2
Product Sense3 questions · ~26 min
Define Feature Success MetricsMedium

Framework for choosing a feature's primary success metric and guardrails before launch.

MetricsFeature PrioritizationProduct VisionBBT Group
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3
Behavioral & Leadership3 questions · ~26 min
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4
More topics7 questions · ~61 min
Top 3 Customers Per RegionMedium
Practice

Task OpenText wants a regional customer-spending view for account planning. Write a PostgreSQL query that identifies the three customers with the highest q...

Window FunctionsJoinsRankingBBT Group
Discuss Model Evaluation TechniquesMedium

Explain your approach to model evaluation, including how you choose and interpret metrics for different ML problems.

PrecisionAccuracyRecallBBT Group
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 IndicatorsDiagnosisBBT Group
Statistical Analysis for DecisionsMedium

Tests your ability to apply statistics to drive decisions and communicate impact.

ExperimentationRegressionCausal InferenceBBT Group
RANK vs DENSE_RANK in LeaderboardsEasy

Explain how RANK() and DENSE_RANK() handle ties differently in ordered SQL results such as leaderboards.

Window FunctionsRankingData WranglingBBT Group
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Top Credit Score Applicants by StateMedium
Practice
Practice drill

Identify the highest-credit-score 5% of applicants within each state using percentiles and window ranking.

Window FunctionsJoinsRankingAmerican Credit Acceptance
Remove Duplicates Keeping LatestMedium
Practice
Practice drill

Delete duplicate contact records while retaining the most recently updated row for each email address.

Window Functionsdata cleaningRankingRevatureBNSF Railway
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