Top 45
Prep plan
Updated weekly · Last refresh Aug 30

Fanduel Data Engineer Interview Questions

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

45questions
~6htotal time
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1
PipelinesStart here. 14 questions · ~114 min
Data Quality in Distributed SystemsMedium

Tests approaches to validation, reconciliation, and consistency in distributed pipelines.

Data Qualitydistributed systemsdata consistencyFanduel
Ingestion Errors and RetriesMedium

Tests resilience patterns like retries, dead-letter handling, and idempotency.

error handlingdata ingestionFanduel
Batch vs Streaming ArchitecturesMedium

Tests understanding of pipeline design trade-offs for different latency needs.

Stream ProcessingBatch Processingdata architectureFanduel
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2
Coding5 questions · ~41 min
Parse JSON Into a DatabaseMedium

Tests Python data parsing and practical loading into relational storage.

json parsingpythonFanduel
Time Complexity for TransformationsMedium

Tests algorithmic thinking and ability to reason about performance.

time complexityperformanceFanduel
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3
SQL & Data Manipulation6 questions + 3 drills · ~79 min
Fix a Timeout on Multi-TB TableHard

Tests deep debugging of query plans, indexing/partitioning, and execution bottlenecks.

performancequery optimizationFanduel
Optimize SQL for Large Fact TablesHard

Tests SQL performance tuning for large-scale analytics workloads.

performanceFanduel
Optimize Slow SQL on MillionsHard

Tests query tuning techniques and performance reasoning at large scale.

Performance Tuningquery optimizationsqlFanduel
SQL for Bet Customer SegmentsMedium
Practice
Practice drill

Calculate settled bet win rates and find FanDuel customers winning at least 60% of three or more bets.

sqlFanduel
Detect Duplicates in DatabaseMedium
Practice
Recently asked
Practice drill

Use a normalization CTE and self-join to find FanDuel player records sharing an email or phone number.

databaseFanduel
Top Models Per Asset ClassEasy
Practice
Practice drill

Rank Balyasny research models by average return within each asset class using DENSE_RANK and aggregation.

performancesqlBalyasny Asset Management
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4
Behavioral & Leadership20 questions · ~164 min
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The finish line: interview-readyComplete all 45 questions plus 3 hands-on drills to finish this plan.