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The Voleon Group Data Analyst Interview Questions

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

21questions
~3htotal time
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1
PipelinesStart here. 5 questions · ~40 min
Fix ETL Type Mismatch CrashHard

Tests debugging and hardening ETL pipelines against schema and type issues.

Data QualityETLschema evolutionThe Voleon Group
De-Duplicate Financial Feed RecordsMedium

Tests data engineering and correctness skills for deduping high-frequency financial events.

Data Qualitydeduplicationfinancial dataThe Voleon Group
Memory-Efficient CSV LoadingMedium

Tests ability to design memory-efficient ingestion and processing pipelines.

Data QualityAutomationCloudThe Voleon Group
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2
SQL & Data Manipulation5 questions + 3 drills · ~70 min
Optimize High-Volume Tick JoinsHard

Tests query optimization techniques for large-scale market data workloads.

Performance TuningJoinspartitioningThe Voleon Group
LEFT vs INNER Join BehaviorMedium

Tests understanding of SQL join semantics and how they affect results and execution.

sql basicsnull handlingjoin typesThe Voleon Group
Split-Adjusted Portfolio PricingHard

Tests ability to model corporate actions correctly with SQL joins for portfolio analytics.

Joinsfinancial dataData WranglingThe Voleon Group
SQL Data Quality ChecksHard
Practice
Practice drill

Detect missing fields, duplicate transaction keys, invalid amounts, and merchant reference issues with PostgreSQL CTEs and joins.

Data Qualitynull handlingdata integritySigmoid
30-Day Moving Average of BookingsMedium
Practice
Practice drill

Build a daily series and compute a 30-day trailing moving average of task bookings using window functions.

Window FunctionsData WranglingAggregationsTaskRabbitRBC
7-Day Moving Average of Daily GMVEasy
Practice
Practice drill

Compute daily paid GMV and a 7-day trailing moving average using aggregation + window functions.

Window FunctionsData WranglingTime SeriesBalyasny Asset ManagementAmazon Development Center U.S.
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3
Behavioral & Leadership10 questions · ~80 min
Tight-Time Take-Home AssessmentEasy

Tests prioritization, execution under time pressure, and communication of technical work.

interview preparationtime managementtechnical experienceThe Voleon Group
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4
More topics1 question · ~8 min
30-Day Rolling Volatility FunctionMedium

Tests statistical implementation details for rolling metrics on market data.

VarianceTime SeriesThe Voleon Group
The finish line: interview-readyComplete all 21 questions plus 3 hands-on drills to finish this plan.