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Updated weekly · Last refresh Aug 30

TransUnion Data Engineer Interview Questions

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

39questions
~5htotal time
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1
SQL & Data ManipulationStart here. 8 questions + 2 drills · ~86 min
SQL Window DeduplicationMedium
Practice
Recently asked

Use ROW_NUMBER and windowed COUNT to retain the latest TruValidate record for each duplicate business key.

Window FunctionsdeduplicationRankingTransUnion
Clustered vs Non-Clustered IndexesMedium

Explain how clustered and non-clustered indexes differ in storage, lookup behavior, and query performance.

JoinsData WranglingTransUnion
Clustered vs Non-Clustered IndexesMedium
Recently asked

Tests understanding of indexing tradeoffs and performance implications for SQL workloads.

Data WranglingperformanceindexesTransUnion
Top Accounts by Support Ticket VolumeEasy
Practice
Practice drill

Task You are given support ticket data and account metadata. Write a PostgreSQL query that returns the top 10 accounts by support ticket volume in the last...

JoinsGroup ByAggregationsTransUnion
Running Totals and Moving AveragesMedium
Practice
Practice drill

Calculate monthly credit utilization, running totals, and three-month moving averages for TransUnion customers.

Window FunctionssqlRunning TotalsTransUnionCNA
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2
Pipelines17 questions · ~141 min
Star vs Snowflake SchemaEasy

Compare star and snowflake schemas in a warehouse pipeline, including structure and transformation trade-offs.

snowflake schemastar schemaData ModelingTransUnion
Handle Late Data in StreamingHard

Design a streaming pipeline that can absorb late-arriving events while keeping aggregates correct and downstream tables stable.

Stream ProcessingIdempotencyData ModelingTransUnion
Spark Lazy Evaluation BasicsMedium
Recently asked

Tests Spark fundamentals and ability to reason about execution planning and performance.

sparkTransUnion
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3
Behavioral & Leadership13 questions · ~108 min
Working with Legacy SystemsMedium
Recently asked

Tests ability to modernize or integrate with legacy systems while delivering reliable data outcomes.

resilienceProblem Solvinglegacy systemsTransUnion
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4
More topics1 question · ~8 min
Swap Lists Without VariablesMedium

Tests coding fundamentals and ability to reason about operations.

Data StructuresTransUnion
The finish line: interview-readyComplete all 39 questions plus 2 hands-on drills to finish this plan.