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Prep plan
Updated weekly · Last refresh Oct 17

Nielsen Data Engineer Interview Questions

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

28questions
~4htotal time
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1
SQL & Data ManipulationStart here. 10 questions + 2 drills · ~106 min
Strictly Increasing Prices QueryHard
Practice

Use LAG and aggregation to find Nielsen products whose observed monthly prices strictly increase.

sqlAggregationsNielsen
Views vs Temporary TablesMedium

Assesses understanding of SQL object semantics and when to use views versus temporary tables.

sqlNielsen
When to Use Database TriggersMedium

Evaluates judgment about using triggers versus application or pipeline logic for data integrity.

databaseNielsen
SQL Joins and AggregationsMedium
Practice
Practice drill

Join policy and ISO ClaimSearch claim data to aggregate claim counts and incurred losses by state and policy type.

JoinsGroup ByAggregationsVerisk AnalyticsMarshBroadridge Financial Solutions
Do You Know Numpy and PandasEasy
Practice
Practice drill

Retrieve the NumPy and pandas definitions from a tool catalog using PostgreSQL filtering and ordering.

pandasnumpyData ManipulationNielsen
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2
Pipelines9 questions · ~78 min
Spark Architecture in DetailMedium

Evaluates deep understanding of Spark components and how they work together for distributed processing.

sparkarchitectureNielsen
Build an Airflow Pipeline StructureMedium

Evaluates ability to design production-ready orchestration for data workflows.

pipeline designairflowNielsen
Spark and Hadoop Architecture Deep DiveHard

Evaluates understanding of distributed execution, deployment modes, and data layout concepts.

data processingsparkoptimizationNielsen
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3
Coding6 questions · ~52 min
N-ary Tree TraversalMedium

Tests your ability to implement correct tree traversal logic and recursion/iteration choices.

Data StructurestraversalTreesNielsen
Anagram Check Without SortingMedium

Assesses your approach to frequency-based string comparison and complexity tradeoffs.

Hash TablesStringsNielsen
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4
Behavioral & Leadership3 questions · ~26 min
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The finish line: interview-readyComplete all 28 questions plus 2 hands-on drills to finish this plan.