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Top 50 DevOps Engineer Interview Questions

The 50 most important questions to prepare for DevOps Engineer interviews. Questions from real interview reports rank first. Updated daily.

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~21htotal time
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1
Hash TablesStart here. 11 questions · ~275 min
Two Sum with TargetEasy
Practice
Recently asked

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysStringsiCapitalPaycomBlend360
First Non-Repeating CharacterEasy
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Recently asked

Find the first non-repeating character in a string using frequency counting and a second pass in O(n) time.

Hash TablesStringsSearchingCloudsekBrightside HealthMcAfee
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2
Recursion9 questions · ~225 min
Reverse a Linked ListEasy
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Reverse a singly linked list in place using pointer manipulation.

RecursionLinked Lists1PasswordAlcatel-Lucent MotiveBlend360
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3
Arrays7 questions · ~175 min
Merge Two Sorted ArraysEasy
Practice
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Merge two sorted arrays into one sorted array using a two-pointer linear scan.

ArraysSortingTwo PointersDropboxTetraScienceBooking
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4
Stack3 questions · ~75 min
Graph Traversal with BFS and DFSEasy
Practice
Recently asked

Traverse a graph from a start node using BFS and DFS, returning the visit order for each traversal.

StackQueueGraphsSiemensSimple TireInformatica
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5
More topics20 questions · ~500 min
Maximum Sum Contiguous SubarrayEasy
Practice
Recently asked

Use Kadane's algorithm to find the contiguous subarray with the largest sum in linear time.

Dynamic ProgrammingArraysGreedyMetaPublicis GroupeSmbc Global Foundation
Parse Logs for Error PatternsMedium
Practice

Parse Pinterest infrastructure logs, count matching error patterns, and rank affected services using dictionaries and sorting.

log parsingfunctionsPinterestLinkedInPony.Ai
Analyze Time and Space ComplexityMedium
Practice
Recently asked

Explain the time and auxiliary space complexity of duplicate detection using a hash set.

space complexitytime complexityArraysWestern DigitalCCodingmart TechnologiesEnterprise Products
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