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Updated weekly · Last refresh Aug 30

DeFiner Data Analyst Interview Questions

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

50questions
~8htotal time
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1
SQL & Data ManipulationStart here. 10 questions · ~92 min
Running Total of Daily SignupsMedium
Practice

Calculate daily DeFiner signups, zero-signup days, prior-day changes, and cumulative totals with CTEs and window functions.

Window FunctionsDate FunctionsRunning TotalsDeFiner
Segment Engagement with CASE WHENHard
Practice

Segment DeFiner users into high, medium, and low engagement using CTEs, aggregations, LAG, and CASE WHEN.

Data WranglingCase WhenAggregationsDeFiner
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2
Pipelines6 questions · ~55 min
Backfilling Missing Pipeline DataMedium

Approach for safely backfilling missing data while preserving correctness, idempotency, and data quality.

ETLQualityDeFiner
ETL vs ELT Trade-offsEasy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData ModelingDeFiner
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3
Statistics & Probability11 questions · ~101 min
Sample Size and Power PlanningMedium

Reason about sample size, power, and minimum detectable effect before launching an experiment.

Hypothesis TestingPower AnalysisSample SizeDeFiner
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4
Product Sense7 questions · ~64 min
Define Prelaunch Feature SuccessEasy

Define how to measure whether a new customer-facing feature will succeed before launch.

Success CriteriaUser NeedsValue PropositionDeFiner
Decide MVP vs Full LaunchMedium

Framework for deciding whether to ship a feature as an MVP or wait for a more complete launch.

Feature PrioritizationMVPProduct VisionDeFiner
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5
Metrics15 questions · ~138 min
Choose Product Success KPIsEasy

Define a practical KPI set for product success, balancing a north star metric with leading indicators.

North Star MetricKPIsLeading IndicatorsDeFiner
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6
More topics1 question · ~9 min
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