Top 11
Prep plan
Updated weekly · Last refresh Aug 30

Reddit Data Analyst Interview Questions

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

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1
SQL & Data ManipulationStart here. 7 questions + 2 drills · ~84 min
Calculate 30-Day User RetentionHard
Practice

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsReddit
Finding Conversion Action SequencesMedium

Tests event-log analysis and SQL techniques for attribution and path-to-conversion discovery.

Data AnalysisReddit
Window Functions vs JoinsMedium

Tests understanding of SQL execution behavior and when to use window functions versus joins.

Window FunctionsJoinsperformanceReddit
Joining Tables EfficientlyMedium

Tests join strategy selection and performance-aware SQL design.

JoinsperformanceReddit
Schema for Subreddit EngagementHard

Tests data modeling for product analytics and designing schemas that support engagement metrics.

schema designdata architectureuser engagementReddit
Optimizing Petabyte QueriesHard

Tests query optimization skills for very large datasets and performance tradeoffs at scale.

Performance Tuningquery optimizationReddit
Median and SQL on Reddit DataMedium
Practice
Practice drill

Compute median post scores per active Reddit community using a CTE, join, filtering, and percentile_cont.

aggregationsqlReddit
SQL on Advertiser MetricsHard
Practice
Practice drill

Use CTEs, aggregation, and a window function to find last week's top advertiser and its daily revenue.

sqlReddit
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2
Behavioral & Leadership3 questions · ~27 min
Prioritizing Competing Data RequestsMedium

Tests prioritization under pressure in a data engineering context, including stakeholder management, trade-off decisions, and ownership of outcomes.

Decision MakingStakeholder ManagementPrioritizationReddit
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3
More topics1 question · ~9 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityReddit

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The finish line: interview-readyComplete all 11 questions plus 2 hands-on drills to finish this plan.