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Updated weekly · Last refresh Oct 17

People Tech Group Data Scientist Interview Questions

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

35questions
~5htotal time
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1
NLPStart here. 5 questions · ~42 min
Personalized Guidance with LLMsMedium

Compare prompt engineering and fine-tuning for an LLM that gives personalized guidance, then show how you would build and evaluate it.

Language ModelsWord EmbeddingsTokenizationPeople Tech Group
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2
Statistics & Probability3 questions · ~25 min
Minimum Detectable Effect for Signup TestMedium

Compute the minimum detectable effect for a signup-page A/B test using power analysis for two proportions and planned traffic.

Power AnalysisSample SizeA/B TestingPeople Tech Group
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3
Machine Learning9 questions · ~75 min
Random Forest vs Gradient BoostingMedium

Compare Random Forest and Gradient Boosting, then choose the right ensemble for a supervised learning task.

Ensemble MethodsBias-Variance TradeoffSupervised LearningPeople Tech Group
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4
Behavioral & Leadership8 questions · ~67 min
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5
More topics10 questions · ~83 min
Optimize Memory Heavy Pandas PipelineMedium

Explain how to reduce memory usage and stabilize a Pandas-based batch pipeline that is failing on larger inputs.

InfrastructureData WranglingQualityPeople Tech Group
Choose Metrics for Imbalanced DataMedium

Choose the right evaluation metric for an imbalanced dataset and explain why accuracy can mislead.

F1 ScorePrecisionAUC-ROCPeople Tech Group
Define Feature Success MetricsMedium

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

MetricsFeature PrioritizationProduct VisionPeople Tech Group
Diagnose KPI Drop After ReleaseMedium

Diagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.

KPILeading IndicatorsDiagnosisPeople Tech Group
SQL for 7-Day Retention LiftMedium

Evaluates your ability to translate retention questions into correct SQL logic.

Date FunctionsJoinsCohort AnalysisPeople Tech Group
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Without AggregatesHard
Practice
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
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
Window Functions for Rolling TrendsMedium
Practice
Practice drill

Calculate rolling survey response rates and rank Ipsos regions by overall response performance.

Window FunctionsDate FunctionsJoinsIpsos
The finish line: interview-readyComplete all 35 questions plus 3 hands-on drills to finish this plan.