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Updated weekly · Last refresh Aug 30

Deloitte Data Engineer Interview Questions

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

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 9 questions + 1 drill · ~86 min
Top Customers by Sales RevenueEasy
Practice

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsDeloitte
Top Products by Sales RevenueEasy
Practice

Find the top 10 products by total sales revenue using joins, aggregation, and a CTE.

RankingGroup ByAggregationsDeloitte
Simplify Reporting Queries with CTEsEasy

Explain how CTEs make complex PostgreSQL queries easier to read, debug, and maintain in reporting workflows.

SubqueriesJoinsCTEsDeloitte
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
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2
Pipelines31 questions · ~263 min
Monitor a Mission Critical PipelineMedium
Recently asked

Design a monitoring and alerting approach for a mission critical pipeline, covering system health, data quality, and operational response.

InfrastructureToolsQualityDeloitte
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityDeloitte
Cleaning Missing Values in PipelinesEasy

Approach for handling missing values in a pipeline with data quality checks and repeatable transformations.

Data WranglingETLQualityDeloitte
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3
Behavioral & Leadership8 questions · ~68 min
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4
More topics2 questions · ~17 min
Process Large JSON in PythonMedium

Tests your ability to write efficient Python for large-scale data parsing and processing.

Hash TablesStringsSortingDeloitte
Efficient Large JSON Parsing in PythonMedium

Tests your ability to design memory-efficient JSON processing for large inputs.

RecursionHash TablesStringsDeloitte
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