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Backend Engineer Interview Preparation

Prepare for backend engineering interviews with system design, databases, and server-side programming questions.

Key Skills & Technologies

System Design
Database Design
API Development
Microservices
Caching
Scalability

Interview Focus Areas

System architecture and scalability
Database design and optimization
API design and REST principles
Caching strategies
Message queues and async processing
Security and authentication

Top Hiring Companies

AmazonMicrosoftGoogleUberDoorDash

Top Backend Engineer Coding Questions

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

#1EasyFrequency: 100%

Two Sum

Asked at Google
Hash TableArray
#1
Recommended
#146MediumFrequency: 100%

LRU Cache

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

Bus Routes

Asked at Uber
Hash TableArrayBreadth-First Search
#3
Recommended
#716HardFrequency: 100%

Max Stack

Asked at LinkedIn
DesignLinked ListStackDoubly-Linked ListOrdered Set
#4
Recommended
#2710MediumFrequency: 100%

Minimum Operations to Reduce an Integer to 0

Asked at Salesforce
Dynamic ProgrammingGreedyBit Manipulation
#5
Recommended
#362MediumFrequency: 100%

Design Hit Counter

Asked at Databricks
DesignArrayBinary SearchQueueData Stream
#6
Recommended
#432HardFrequency: 93.8%

All O`one Data Structure

Asked at LinkedIn
Hash TableDesignLinked ListDoubly-Linked List
#7
Recommended
#348MediumFrequency: 93.6%

Design Tic-Tac-Toe

Asked at Databricks
Hash TableDesignArrayMatrixSimulation
#8
Recommended
#314MediumFrequency: 93.4%

Binary Tree Vertical Order Traversal

Asked at Meta
Hash TableTreeDepth-First SearchBreadth-First SearchSortingBinary Tree
#9
Recommended
#1352HardFrequency: 93%

Maximum Profit in Job Scheduling

Asked at Airbnb
Dynamic ProgrammingArrayBinary SearchSorting
#10
Recommended
#3MediumFrequency: 92.8%

Longest Substring Without Repeating Characters

Asked at Infosys
Hash TableStringSliding Window
#11
Recommended
#329HardFrequency: 92.5%

Longest Increasing Path in a Matrix

Asked at DoorDash
Dynamic ProgrammingArrayDepth-First SearchBreadth-First SearchGraph TheoryTopological SortMemoizationMatrixDirected Acyclic Graph
#12
Recommended
#124HardFrequency: 90.2%

Binary Tree Maximum Path Sum

Asked at DoorDash
Dynamic ProgrammingTreeDepth-First SearchBinary TreeDP on Trees
#13
Recommended
#305HardFrequency: 89.9%

Number of Islands II

Asked at Uber
Hash TableArrayUnion-Find
#14
Recommended
#300MediumFrequency: 89.7%

Longest Increasing Subsequence

Asked at TikTok
Dynamic ProgrammingArrayBinary SearchLongest Increasing Subsequence
#15
Recommended
#1790MediumFrequency: 88.5%

Lowest Common Ancestor of a Binary Tree III

Asked at Meta
Hash TableTreeTwo PointersBinary TreeBinary LiftingLowest Common Ancestor
#16
Recommended
#42HardFrequency: 88%

Trapping Rain Water

Asked at Amazon
Dynamic ProgrammingArrayTwo PointersStackMonotonic Stack
#17
Recommended
#560MediumFrequency: 87.2%

Subarray Sum Equals K

Asked at Meta
Hash TableArrayPrefix Sum
#18
Recommended
#772MediumFrequency: 87%

Construct Quad Tree

Asked at Uber
TreeArrayDivide and ConquerMatrix
#19
Recommended
#543EasyFrequency: 86.8%

Diameter of Binary Tree

Asked at Meta
TreeDepth-First SearchBinary TreeDP on Trees
#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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