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Updated weekly · Last refresh Oct 17

The City Of Providence Data Engineer Interview Questions

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

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1
PipelinesStart here. 5 questions · ~44 min
Design SCD Type 1 and 2Medium

Design and implement SCD Type 1 and Type 2 dimensions with history tracking, idempotent loads, and data quality controls.

slowly changing dimensionsData ModelingBackfillingThe City Of Providence
Star vs Snowflake SchemaEasy

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

snowflake schemastar schemaData ModelingThe City Of Providence
ETL vs ELT Trade-offsEasy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData ModelingThe City Of Providence
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2
SQL & Data Manipulation5 questions + 2 drills · ~64 min
Clustered vs Non-Clustered IndexesMedium

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

JoinsData WranglingThe City Of Providence
Find Duplicate Municipal TransactionsMedium
Practice

Use window functions to identify duplicate municipal transaction records and show each duplicate's count and sequence.

Window Functionsdeduplicationdata cleaningThe City Of Providence
Import CSV With Nulls SafelyMedium

Tests data validation, cleansing, and safe ingestion practices for external files.

null handlingData Wranglingdata integrityThe City Of Providence
SQL for Top Performing RetailersHard
Practice
Practice drill

Rank retailers by seasonally adjusted quarterly sales and return the top 10 percent using PostgreSQL CTEs and window functions.

Window FunctionsDate FunctionsRankingThe City Of Providence
Second Highest Without AggregatesHard
Practice
Practice drill

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

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
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3
Behavioral & Leadership6 questions · ~52 min
Leading an End-to-End Analytics ProjectMedium

Tests ownership of an end-to-end analytics project, including cross-functional collaboration, technical judgment, and measurable business impact.

LeadershipOwnershipcollaborationThe City Of Providence
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4
More topics1 question · ~9 min
Coding Fundamentals for Data EngineeringMedium

Assesses breadth of core CS fundamentals relevant to building reliable data systems.

Data StructuresoopThe City Of Providence
The finish line: interview-readyComplete all 17 questions plus 2 hands-on drills to finish this plan.