Top 18
Prep plan
Updated weekly · Last refresh Aug 30

Patreon Data Engineer Interview Questions

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

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1
CodingStart here. 4 questions · ~40 min
Sliding Window API Rate LimiterMedium
Practice

Implement a per-user sliding window rate limiter that accepts or rejects requests in O(1) amortized time.

Hash TablesQueueGreedyPatreon
Two Sum Coding ProblemEasy
Practice

Find two array values that sum to a target using a hash map in O(n) time.

leetcodeAlgorithmsPatreon
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2
Pipelines7 questions · ~69 min
API Ingestion With Rate LimitsEasy

Discuss integrating a third party API into a pipeline and handling rate limits without duplicating or losing data.

ToolsIdempotencyDependenciesPatreon
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityPatreon
Cloud Pipeline Data SecurityMedium

Key security considerations for a cloud data pipeline, from ingestion through storage, orchestration, and monitoring.

InfrastructureGovernanceETLPatreon
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3
SQL & Data Manipulation3 questions + 3 drills · ~60 min
Hash Join vs Merge JoinMedium

Tests understanding of join algorithms and query planner decision-making.

Performance Tuningsql basicsJoinsPatreon
Diagnose Slow Aggregation QueryHard

Tests query diagnosis, performance tuning, and scalability for Patreon-scale analytics.

Performance Tuningquery optimizationAggregationsPatreon
Optimize Join With Dynamic MetadataHard

Tests SQL optimization strategies for skewed joins and frequently changing dimensions.

Performance TuningJoinsindexesPatreon
Conversion Rate by Channel SegmentMedium
Practice
Practice drill

Use joins, a CTE, and aggregation to compute 30-day conversion rate by acquisition channel and customer segment.

JoinsGroup ByCase WhenMotiveHelloFreshBartech Staffing
SQL for Course Enrollment MetricsMedium
Practice
Practice drill

Use LEFT JOINs and aggregation to summarize published Patreon education courses by active professor and department.

JoinssqlPatreon
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
4
Behavioral & Leadership4 questions · ~40 min
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The finish line: interview-readyComplete all 18 questions plus 3 hands-on drills to finish this plan.