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Data Engineer Interview Preparation

Data engineering interview preparation with focus on data pipelines, ETL, and big data technologies.

Key Skills & Technologies

Data Pipelines
ETL/ELT
Big Data Technologies
Data Warehousing
Stream Processing
SQL

Interview Focus Areas

Data pipeline design and implementation
ETL/ELT processes and optimization
Big data technologies (Spark, Hadoop)
Data warehousing and modeling
Stream processing and real-time data
Data quality and monitoring

Top Hiring Companies

GoogleAmazonMicrosoftDatabricksSnowflake

Top Data Engineer Coding Questions

Practice these 20 most relevant coding problems for data engineer interviews.

#1EasyFrequency: 100%

Two Sum

Asked at Google
ArrayHash Table
#1
Recommended
#146MediumFrequency: 100%

LRU Cache

Asked at Apple
Hash TableDesignLinked ListDoubly-Linked List
#2
Recommended
#833HardFrequency: 100%

Bus Routes

Asked at Uber
ArrayHash TableBreadth-First Search
#3
Recommended
#716HardFrequency: 100%

Max Stack

Asked at LinkedIn
DesignLinked ListStackDoubly-Linked ListOrdered Set
#4
Recommended
#286MediumFrequency: 100%

Walls and Gates

Asked at DoorDash
ArrayBreadth-First SearchMatrix
#5
Recommended
#68HardFrequency: 100%

Text Justification

Asked at Airbnb
ArrayStringSimulation
#6
Recommended
#1538MediumFrequency: 100%

Maximum Points You Can Obtain from Cards

Asked at Flipkart
ArraySliding WindowPrefix Sum
#7
Recommended
#750HardFrequency: 100%

Contain Virus

Asked at Flipkart
ArrayDepth-First SearchBreadth-First SearchMatrixSimulation
#8
Recommended
#362MediumFrequency: 100%

Design Hit Counter

Asked at Databricks
ArrayDesignBinary SearchQueueData Stream
#9
Recommended
#200MediumFrequency: 97.3%

Number of Islands

Asked at TikTok
ArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix
#10
Recommended
#269HardFrequency: 95.2%

Alien Dictionary

Asked at Uber
ArrayStringDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph
#11
Recommended
#1306EasyFrequency: 94.7%

Minimum Absolute Difference

Asked at PayPal
ArraySorting
#12
Recommended
#1549MediumFrequency: 94.4%

Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Asked at Uber
ArrayQueueSliding WindowHeap (Priority Queue)Ordered SetMonotonic Queue
#13
Recommended
#432HardFrequency: 93.8%

All O`one Data Structure

Asked at LinkedIn
Hash TableDesignLinked ListDoubly-Linked List
#14
Recommended
#348MediumFrequency: 93.6%

Design Tic-Tac-Toe

Asked at Databricks
ArrayHash TableDesignMatrixSimulation
#15
Recommended
#314MediumFrequency: 93.4%

Binary Tree Vertical Order Traversal

Asked at Meta
Hash TableSortingTreeDepth-First SearchBreadth-First SearchBinary Tree
#16
Recommended
#215MediumFrequency: 93.3%

Kth Largest Element in an Array

Asked at Meta
ArraySortingDivide and ConquerHeap (Priority Queue)Quickselect
#17
Recommended
#1352HardFrequency: 93%

Maximum Profit in Job Scheduling

Asked at Airbnb
ArraySortingBinary SearchDynamic Programming
#18
Recommended
#3MediumFrequency: 92.8%

Longest Substring Without Repeating Characters

Asked at Infosys
Hash TableStringSliding Window
#19
Recommended
#329HardFrequency: 92.5%

Longest Increasing Path in a Matrix

Asked at DoorDash
ArrayDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph TheoryTopological SortMemoizationMatrixDirected Acyclic Graph
#20
Recommended

All Interview Questions

Browse questions by company and difficulty level

Topics & Algorithms

Practice by specific algorithm and data structure topics

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