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Updated weekly · Last refresh Oct 17

Viasat Data Scientist Interview Questions

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

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1
Machine LearningStart here. 4 questions · ~36 min
Assessing Overfitting vs UnderfittingMedium

Use training, validation, and cross-validation behavior to distinguish underfitting from overfitting in supervised models.

Cross-ValidationBias-Variance TradeoffRegularizationViasat
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2
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 SizeViasat
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3
SQL & Data Manipulation3 questions + 1 drill · ~37 min
Rolling 7-Day Average with Window FunctionsMedium
Practice

Calculate patient rolling 7-day averages and rank patients within each Medpace research site using layered window functions.

Window FunctionsRankingRunning TotalsViasat
SQL Query ConstructionMedium
Practice
Recently asked
Practice drill

Aggregate Viasat session usage once, identify subscribers over their caps, and explain why the 6-billion-row table is slow.

large datasetsindexessqlViasat
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4
Metrics3 questions · ~27 min
Diagnosing Post-Rollout Metric DropsHard

Tests root-cause analysis using data, instrumentation, and experiment/segment reasoning.

Funnel AnalysisDiagnosisrollout metricsViasat
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5
Behavioral & Leadership13 questions · ~116 min
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6
More topics5 questions · ~45 min
Evaluating Imbalanced Classification ModelsMedium

Explain how to evaluate a classifier on imbalanced data, with focus on metrics that are more informative than accuracy.

F1 ScorePrecisionRecallViasat
Design Test for Novelty and SpilloversHard

Design an experiment that accounts for novelty effects and network spillovers before deciding whether to ship.

Network InterferenceExperimentationNovelty EffectViasat
Scalable Data Pipeline ArchitectureMedium

Tests system design thinking for data pipelines and scalability tradeoffs.

data pipelinesscalabilitytechnical experienceViasat
Python Data Structures ChoiceEasy

Tests practical Python knowledge and correct selection of data structures.

Data Structurespython basicstechnical fundamentalsViasat
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