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Prep plan

Updated weekly · Last refresh Nov 6

Bristlecone Data Engineer Interview Questions

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

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SQL & Data ManipulationStart here. 2 questions + 3 drills · ~46 min

Data Warehouse vs DatabaseMedium

Tests understanding of core data architecture choices and AWS services for analytics workloads.

aws

Bristlecone

SQL, Joins, and ETL LogicMedium

Evaluates ability to write and reason about SQL transformations used in ETL pipelines.

ETLsql

Bristlecone

Explain ETL ProcessMedium

Practice

Practice drill

Demonstrate ETL by extracting staged sales, cleaning values, validating records, and producing load-ready output.

data cleaningdata processingETL

Plaid

Bristlecone

Second Highest Without AggregatesHard

Practice

Practice drill

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

SubqueriesRankingSelf-Joins

Credit Genie

Devoteam

Cisco Restaurant + Bar

Use Window FunctionsMedium

Practice

Practice drill

Demonstrate window functions by ranking active employees by salary within each department.

Window FunctionsData ManipulationRanking

Johnson & Johnson

AvidXchange

CRIF

Pipelines1 question · ~8 min

ETL Inputs and Data SourcesMedium

Assesses knowledge of ETL input data selection, validation, and schema evolution considerations.

ETL

Bristlecone

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Behavioral & Leadership1 question · ~8 min

OOP and Python FundamentalsMedium

Assesses OOP and Python fundamentals and their practical application in data engineering work.

pythonoop

Bristlecone

The finish line: interview-readyComplete all 4 questions plus 3 hands-on drills to finish this plan.