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NIH Interview Questions

The questions to prepare for NIH interviews, across all roles. Questions from real interview reports rank first. Updated daily.

50questions
~7htotal time
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1
ExecutionStart here. 21 questions · ~170 min
Handle Scope Creep Mid-ProjectMedium

Explain how you would manage scope creep without damaging stakeholder trust or putting delivery at risk.

Trade-offsRisk AssessmentScope ManagementNIH
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2
Machine Learning6 questions · ~48 min
Lab Techniques and ApplicationMedium

Tests depth of experimental skills and your ability to connect methods to results.

Problem SolvingNIH
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3
System Design4 questions · ~32 min
Clinical Research Data IntegrityHard

Tests ability to design for correctness, validation, and integrity constraints in clinical contexts.

data integrityNIH
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4
Coding7 questions + 1 drill · ~67 min
SQL and Programming Coding AssessmentMedium

Tests practical problem-solving across SQL and general programming within a timed assessment.

ProgrammingsqlNIH
Writing SAS Code Under PressureMedium
Practice
Practice drill

Identify missing, unexpected, duplicate, and inconsistent derived records using PostgreSQL validation queries.

Codingdata accuracydata verificationCCytel Inc
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5
Behavioral & Leadership6 questions · ~48 min
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6
More topics6 questions · ~48 min
Optimize Slow Database QueriesHard

Tests performance troubleshooting skills and ability to optimize SQL for large-scale data.

database optimizationlarge datasetsNIH
Measuring Post-Implementation SuccessMedium

Tests how you define and track outcomes, KPIs, and adoption to validate project impact.

KPINIH
Hardware Problem SolvingMedium

Assesses troubleshooting approach for hardware-related issues.

HardwareTroubleshootingNIH
Mechanisms Behind Your StudiesMedium

Evaluates depth of scientific understanding and ability to explain mechanisms clearly.

NIH
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Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Detect Consecutive Losing StreaksMedium
Practice
Practice drill

Identify bet365 users with consecutive losing bets above a risk threshold using ordered streak grouping.

abuse trackingData Manipulationsql querybet365
Mitigate Data Skew in JoinsHard
Practice
Practice drill

Detect a heavily skewed join key and produce a deterministically salted join result for more balanced large-scale processing.

database optimizationlarge datasetsJoinsDatabricks
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.