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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
#3594MediumFrequency: 100%

Identify the Largest Outlier in an Array

Asked at Amazon
Hash TableArrayCountingEnumeration
#2
Recommended
#3655MediumFrequency: 100%

Digit Operations to Make Two Integers Equal

Asked at Microsoft
GraphMathHeap (Priority Queue)Number TheoryShortest Path
#3
Recommended
#1352HardFrequency: 100%

Maximum Profit in Job Scheduling

Asked at Apple
Dynamic ProgrammingArrayBinary SearchSorting
#4
Recommended
#232EasyFrequency: 100%

Implement Queue using Stacks

Asked at TikTok
DesignStackQueue
#5
Recommended
#3613MediumFrequency: 100%

Maximize Amount After Two Days of Conversions

Asked at Uber
GraphArrayStringDepth-First SearchBreadth-First Search
#6
Recommended
#716HardFrequency: 100%

Max Stack

Asked at LinkedIn
DesignLinked ListStackDoubly-Linked ListOrdered Set
#7
Recommended
#392EasyFrequency: 100%

Is Subsequence

Asked at Oracle
Dynamic ProgrammingTwo PointersString
#8
Recommended
#64MediumFrequency: 100%

Minimum Path Sum

Asked at Salesforce
Dynamic ProgrammingArrayMatrix
#9
Recommended
#817EasyFrequency: 100%

Design HashMap

Asked at DoorDash
Hash TableDesignArrayLinked ListHash Function
#10
Recommended
#322MediumFrequency: 100%

Coin Change

Asked at Airbnb
Dynamic ProgrammingArrayBreadth-First Search
#11
Recommended
#42HardFrequency: 100%

Trapping Rain Water

Asked at PayPal
Dynamic ProgrammingArrayTwo PointersStackMonotonic Stack
#12
Recommended
#694MediumFrequency: 98%

Number of Distinct Islands

Asked at Flipkart
Hash TableDepth-First SearchBreadth-First SearchUnion FindHash Function
#13
Recommended
#314MediumFrequency: 97%

Binary Tree Vertical Order Traversal

Asked at Meta
Hash TableTreeDepth-First SearchBreadth-First SearchSortingBinary Tree
#14
Recommended
#833HardFrequency: 95%

Bus Routes

Asked at Uber
Hash TableArrayBreadth-First Search
#15
Recommended
#152MediumFrequency: 93%

Maximum Product Subarray

Asked at Salesforce
Dynamic ProgrammingArray
#16
Recommended
#1790MediumFrequency: 91%

Lowest Common Ancestor of a Binary Tree III

Asked at Meta
Hash TableTreeTwo PointersBinary Tree
#17
Recommended
#129MediumFrequency: 91%

Sum Root to Leaf Numbers

Asked at Apple
TreeDepth-First SearchBinary Tree
#18
Recommended
#1423MediumFrequency: 91%

Maximum Number of Occurrences of a Substring

Asked at Infosys
Hash TableStringSliding Window
#19
Recommended
#122MediumFrequency: 90%

Best Time to Buy and Sell Stock II

Asked at Oracle
Dynamic ProgrammingArrayGreedy
#20
Recommended

All Interview Questions

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Topics & Algorithms

Practice by specific algorithm and data structure topics

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