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Updated weekly · Last refresh Aug 30

Branch Data Scientist Interview Questions

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

23questions
~3htotal time
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1
System DesignStart here. 3 questions · ~25 min
Design Cold Start RecommendationsHard

Design a recommendation system strategy for new users and new items when interaction history is sparse or missing.

Cold StartFeature StoreRecommendation SystemsBranch
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2
Behavioral & Leadership8 questions · ~65 min
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3
More topics12 questions · ~98 min
Evaluating Observed Lift SignificanceMedium

Explain how to test whether an observed experiment lift is real using hypothesis testing, p-values, and confidence intervals.

Confidence IntervalsStatistical SignificanceP-ValuesBranch
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 IndicatorsDiagnosisBranch
Experiment for Fragmented JourneysHard

Tests your ability to design robust experiments for fragmented user journeys in Branch’s attribution flows.

experiment designdeep linkingBranch
String Matching for Similar QueriesMedium

Tests your ability to implement foundational string similarity logic for grouping noisy text inputs.

Feature EngineeringBranch
Mobile Log Processing OptimizationMedium

Tests performance engineering and memory-safe data processing for large-scale mobile event logs.

Batch ProcessingBranch
First-Touch and Last-Touch Attribution SQLMedium

Tests SQL window function usage for deriving first-touch and last-touch attribution tables.

Window FunctionsattributionBranch
Attribution Effectiveness MeasurementMedium

Tests how you define metrics and evaluate multi-touch attribution quality for Branch’s mobile marketing and deep linking.

attributionBranch
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
Deduplicate and Keep LatestEasy
Practice
Practice drill

Keep the latest valid Gartner Peer Insights review per source key using ROW_NUMBER and deterministic tie-breaking.

Window FunctionsRankingData WranglingGartner
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 BankNavi
The finish line: interview-readyComplete all 23 questions plus 3 hands-on drills to finish this plan.