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Updated weekly · Last refresh Oct 17

Navi Data Scientist Interview Questions

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

35questions
~5htotal time
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1
A/B Testing & ExperimentationStart here. 3 questions · ~25 min
Choosing Randomization Unit for UI TestMedium

Choose the right randomization unit for a customer-facing experiment and explain how that choice affects metrics, power, and validity.

ExperimentationGuardrail MetricsA/B TestingNavi
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2
System Design3 questions · ~25 min
Design Real-Time Fraud Risk ScoringHard

Design a real-time fraud scoring system for card transactions with strict latency, delayed labels, and high availability requirements.

Feature StoreFeature DriftModel ServingNavi
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3
Machine Learning10 questions · ~82 min
L1 vs L2 RegularizationMedium

Explain how L1 and L2 regularization differ geometrically and probabilistically, grounded in a practical supervised learning example.

Feature EngineeringRegularizationSupervised LearningNavi
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4
Behavioral & Leadership8 questions · ~66 min
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5
More topics11 questions · ~91 min
Statistical vs Practical SignificanceMedium

Explain why a statistically significant experiment result may still be too small to matter for product or business decisions.

Confidence IntervalsExperimentationHypothesis TestingNavi
Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosisNavi
SQL Window Functions for FunnelsMedium

Tests your ability to use SQL window functions for time-ordered behavioral analysis.

Window FunctionsFunnel AnalysisRunning TotalsNavi
Imbalanced Metrics and DriftHard

Evaluates metric choice for imbalance and practical monitoring for drift in production.

Navi
TF-IDF Search Engine in PythonMedium

Tests your ability to implement core NLP retrieval using TF-IDF and Python.

TF-IDFNavi
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Customers by Region VolumeMedium
Practice
Practice drill

Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.

Window FunctionsJoinsRankingJPMorganChaseSilicon Valley BankBanco Santander
Detect Missed Consecutive InstallmentsMedium
Practice
Practice drill

Identify Navi users with consecutive missed monthly installments and return each qualifying missed-payment streak.

Window FunctionsLag/LeadDate FunctionsNavi
Window Functions and Churn SQLMedium
Practice
Practice drill

Calculate monthly Navi lending customer churn rates by comparing each customer's current and previous activity status.

Window FunctionsLag/LeadDate FunctionsNavi
The finish line: interview-readyComplete all 35 questions plus 3 hands-on drills to finish this plan.