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DeFiner Interview Questions

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

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1
SQL & Data ManipulationStart here. 10 questions · ~92 min
Top Products by Sales RevenueEasy
Practice

Find the top 10 products by total sales revenue using joins, aggregation, and a CTE.

RankingGroup ByAggregationsDeFiner
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
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityDeFiner
Backfilling Missing Pipeline DataMedium

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

ETLQualityDeFiner
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3
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
Classify Leading vs Lagging MetricsEasy

Explain how to distinguish early directional metrics from outcome metrics, using a clear KPI framework tied to product decisions.

Lagging IndicatorsKPIsLeading IndicatorsDeFiner
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4
Product Sense7 questions · ~64 min
Approach User Research in DesignEasy

Explain a practical approach to user research in the design process, from understanding user needs to turning findings into design decisions.

Jobs to Be DoneUser ResearchUser NeedsDeFiner
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5
Statistics & Probability11 questions · ~101 min
Interpreting P Values in TestingEasy

Explain what a p-value means in hypothesis testing and how it relates to statistical significance.

Hypothesis TestingStatistical SignificanceP-ValuesDeFiner
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6
More topics1 question · ~9 min
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