Top 34
Prep plan
Updated weekly · Last refresh Aug 30

Plaid Data Scientist Interview Questions

The questions to prepare for a Plaid Data Scientist interview. Questions from real interview reports rank first. Updated weekly.

34questions
~5htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 1 drill · ~37 min
2
A/B Testing & Experimentation5 questions · ~45 min
Pitfalls in Streaming Experiment AnalysisHard

Identify major online experiment pitfalls and explain how they can bias results in a streaming product A/B test.

Network InterferenceNovelty EffectSample Ratio MismatchPlaid
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3
Metrics3 questions · ~27 min
Choose Metrics for New FeaturesEasy

Define a practical framework for selecting a north star, supporting KPIs, and leading indicators for a new product feature.

North Star MetricKPIsLeading IndicatorsPlaid
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4
Machine Learning3 questions · ~27 min
Supervised vs Unsupervised LearningEasy

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

Unsupervised LearningFeature EngineeringBias-Variance TradeoffPlaid
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5
Product Sense3 questions · ~27 min
Assess Feedback for Product ImprovementsEasy

Framework for evaluating customer feedback and turning it into prioritized product improvements.

User ResearchUser NeedsPain PointsPlaid
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6
Statistics & Probability3 questions · ~27 min
Sample Size and Power PlanningMedium

Reason about sample size, power, and minimum detectable effect before launching an experiment.

Hypothesis TestingPower AnalysisSample SizePlaid
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7
More topics14 questions · ~125 min
Approach to Underperforming ModelsMedium

Structured approach for diagnosing an underperforming model and deciding whether to fix data, thresholding, calibration, or the model.

PrecisionAccuracyRecallPlaid
Real-Time Dashboard Pipeline DesignHard

Approach for building near-real-time dashboard pipelines with streaming, orchestration, and data quality controls.

Stream ProcessingSchedulingDependenciesPlaid
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The finish line: interview-readyComplete all 34 questions plus 1 hands-on drill to finish this plan.