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The Johns Hopkins University Interview Questions

The questions to prepare for The Johns Hopkins University interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 1 drill · ~45 min
2
Execution5 questions · ~43 min
3
Pipelines4 questions · ~35 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityThe Johns Hopkins University
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4
Metrics4 questions · ~35 min
Measure Marketing Campaign SuccessEasy

Define campaign success using business KPIs, funnel conversion, acquisition cost, and leading indicators tied to outcomes.

Funnel AnalysisKPIsLeading IndicatorsThe Johns Hopkins University
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5
A/B Testing & Experimentation3 questions · ~26 min
Common Pitfalls in Experiment ResultsHard

Identify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.

PeekingNovelty EffectSample Ratio MismatchThe Johns Hopkins University
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6
Statistics & Probability4 questions · ~35 min
Statistical Significance in Hypothesis TestingEasy

Explain what statistical significance means and why it matters when interpreting experimental or analytical results.

Hypothesis TestingData AnalysisStatistical SignificanceThe Johns Hopkins University
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7
More topics26 questions · ~225 min
Feature Engineering and Model PerformanceEasy

Explain how feature engineering improves supervised model performance and how to validate its impact with proper evaluation.

Feature EngineeringBias-Variance TradeoffSupervised LearningThe Johns Hopkins University
Choose the Right Evaluation MetricsEasy

Pick the right metrics to evaluate a machine learning model and explain why they fit the problem.

PrecisionAccuracyRecallThe Johns Hopkins University
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The finish line: interview-readyComplete all 50 questions plus 1 hands-on drill to finish this plan.