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Updated weekly · Last refresh Oct 17

Citizens Data Engineer Interview Questions

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

39questions
~5htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~54 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCitizens
Complex SQL Joins and AggregatesHard

Evaluates advanced SQL reasoning and correctness for complex analytical queries.

JoinssqlAggregationsCitizens
SQL for Regional Efficiency TrendsHard
Practice
Practice drill

Combine monthly transaction and staffing data to calculate regional efficiency and month-over-month trends.

Date FunctionsJoinsAggregationsCitizens
Top Customers by Sales RevenueEasy
Practice
Practice drill

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

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
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2
Coding5 questions · ~42 min
Explain Algorithm Time ComplexityEasy

Explain how to analyze the time complexity of a solution by examining loops, recursion, and dominant operations.

MathArraysSortingCitizens
CSV Processing in PythonMedium

Tests practical Python skills for transforming data for downstream use at Citizens.

CodingArraysStringsCitizens
Spring Boot and LeetCodeMedium

Assesses backend framework familiarity and coding problem-solving skills.

leetcodespring bootCitizens
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3
Pipelines18 questions · ~151 min
Design High-Throughput Event PipelineHard

Design a real-time event pipeline that can handle millions of events per second with sub-second latency.

data pipelineevent processinglatencyCitizens
Handle Incomplete Pipeline DataMedium

Approach for handling missing, inconsistent, and duplicate data in a pipeline without breaking downstream analytics.

Data WranglingETLQualityCitizens
Design an End-to-End Data PipelineMedium

Approach for designing an end-to-end data pipeline from ingestion through transformation, storage, and downstream consumption.

data pipelinedesigningestionCitizens
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4
Behavioral & Leadership12 questions · ~101 min
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The finish line: interview-readyComplete all 39 questions plus 2 hands-on drills to finish this plan.