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141+ LinkedIn questions

LinkedIn interview questions and how to prepare

The questions candidates report from LinkedIn interviews, sorted by how often they come up, with difficulty and topics, plus original practice written in LinkedIn's interview style.

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ZorixOS tracks 141 community-reported LinkedIn interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 98 original ZorixOS practice questions written in LinkedIn's known interview style (not claimed as asked at LinkedIn), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to LinkedIn.

Updated July 2026

LinkedIn interview questions candidates report

Community-reported from real LinkedIn interviews (open-source dataset), most-asked first. Showing 60 of 141. Each links to its source.

  1. Max Stack
    Linked ListStackDesignDoubly-Linked List
    Hard100% asked
  2. All O`one Data Structure
    Hash TableLinked ListDesignDoubly-Linked List
    Hard98% asked
  3. Nested List Weight Sum II
    StackDepth-First SearchBreadth-First Search
    Medium95% asked
  4. Max Consecutive Ones III
    ArrayBinary SearchSliding WindowPrefix Sum
    Medium86% asked
  5. Pow(x, n)
    MathRecursion
    Medium80% asked
  6. Find the Celebrity
    Two PointersGraphInteractive
    Medium79% asked
  7. Word Ladder
    Hash TableStringBreadth-First Search
    Hard79% asked
  8. Valid Parentheses
    StringStack
    Easy79% asked
  9. Design Authentication Manager
    Hash TableLinked ListDesignDoubly-Linked List
    Medium78% asked
  10. Nested List Weight Sum
    Depth-First SearchBreadth-First Search
    Medium78% asked
  11. Find Leaves of Binary Tree
    TreeDepth-First SearchBinary Tree
    Medium77% asked
  12. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium77% asked
  13. Shortest Word Distance II
    ArrayHash TableTwo PointersString
    Medium77% asked
  14. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion Find
    Medium76% asked
  15. Maximum Product Subarray
    ArrayDynamic Programming
    Medium75% asked
  16. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium75% asked
  17. Sort Transformed Array
    ArrayMathTwo PointersSorting
    Medium73% asked
  18. Can Place Flowers
    ArrayGreedy
    Easy72% asked
  19. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium71% asked
  20. Binary Tree Upside Down
    TreeDepth-First SearchBinary Tree
    Medium69% asked
  21. Partition to K Equal Sum Subsets
    ArrayDynamic ProgrammingBacktrackingBit Manipulation
    Medium69% asked
  22. Exclusive Time of Functions
    ArrayStack
    Medium68% asked
  23. Find First and Last Position of Element in Sorted Array
    ArrayBinary Search
    Medium68% asked
  24. Kth Largest Element in an Array
    ArrayDivide and ConquerSortingHeap (Priority Queue)
    Medium68% asked
  25. Lowest Common Ancestor of a Binary Search Tree
    TreeDepth-First SearchBinary Search TreeBinary Tree
    Medium68% asked
  26. Paint House
    ArrayDynamic Programming
    Medium68% asked
  27. Serialize and Deserialize Binary Tree
    StringTreeDepth-First SearchBreadth-First Search
    Hard66% asked
  28. Letter Combinations of a Phone Number
    Hash TableStringBacktracking
    Medium65% asked
  29. Maximize Subarrays After Removing One Conflicting Pair
    ArraySegment TreeEnumerationPrefix Sum
    Hard65% asked
  30. Building H2O
    Concurrency
    Medium65% asked
  31. Minimum Window Substring
    Hash TableStringSliding Window
    Hard65% asked
  32. Factor Combinations
    Backtracking
    Medium64% asked
  33. Maximum Depth of Binary Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy64% asked
  34. Shortest Word Distance
    ArrayString
    Easy64% asked
  35. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium63% asked
  36. Lowest Common Ancestor of a Binary Tree
    TreeDepth-First SearchBinary Tree
    Medium63% asked
  37. Closest Binary Search Tree Value II
    Two PointersStackTreeDepth-First Search
    Hard63% asked
  38. Isomorphic Strings
    Hash TableString
    Easy62% asked
  39. Kth Smallest Product of Two Sorted Arrays
    ArrayBinary Search
    Hard62% asked
  40. Process Tasks Using Servers
    ArrayHeap (Priority Queue)
    Medium62% asked
  41. Merge Intervals
    ArraySorting
    Medium61% asked
  42. Symmetric Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy61% asked
  43. Count Integers in Intervals
    DesignSegment TreeOrdered Set
    Hard60% asked
  44. Valid Number
    String
    Hard60% asked
  45. Valid Perfect Square
    MathBinary Search
    Easy60% asked
  46. Longest Palindromic Subsequence
    StringDynamic Programming
    Medium59% asked
  47. Longest Valid Parentheses
    StringDynamic ProgrammingStack
    Hard59% asked
  48. Find Pivot Index
    ArrayPrefix Sum
    Easy59% asked
  49. Max Points on a Line
    ArrayHash TableMathGeometry
    Hard59% asked
  50. Second Minimum Node In a Binary Tree
    TreeDepth-First SearchBinary Tree
    Easy59% asked
  51. Evaluate Reverse Polish Notation
    ArrayMathStack
    Medium58% asked
  52. House Robber
    ArrayDynamic Programming
    Medium58% asked
  53. Repeated DNA Sequences
    Hash TableStringBit ManipulationSliding Window
    Medium58% asked
  54. Flatten Nested List Iterator
    StackTreeDepth-First SearchDesign
    Medium57% asked
  55. Binary Tree Level Order Traversal
    TreeBreadth-First SearchBinary Tree
    Medium56% asked
  56. Can I Win
    MathDynamic ProgrammingBit ManipulationMemoization
    Medium56% asked
  57. Find K Pairs with Smallest Sums
    ArrayHeap (Priority Queue)
    Medium56% asked
  58. Merge Two Sorted Lists
    Linked ListRecursion
    Easy55% asked
  59. Permutations
    ArrayBacktracking
    Medium55% asked
  60. Permutations II
    ArrayBacktrackingSorting
    Medium55% asked

These are the 60 most-reported of 141 tracked LinkedIn questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in LinkedIn's style

Original ZorixOS questions written the way LinkedIn interviews, so you rehearse the real format. Not claimed as asked at LinkedIn.

  1. Imagine a scenario where LinkedIn's feed ranking algorithm is experiencing a sudden drop in engagement metrics. Describe your approach to debugging this issue, starting from the initial alerts to identifying the root cause. What specific metrics would you monitor, and what hypotheses would you explore first?

    Software EngineerDebuggingTests: Evaluates problem-solving, analytical skills, and knowledge of distributed systems under pressure.

  2. Design a system to handle real-time notifications for new connections and messages on LinkedIn. Consider the scale (millions of users, billions of connections), latency requirements, and fault tolerance. What technologies would you choose and why?

    Software EngineerSystem DesignTests: Assesses system design thinking, scalability considerations, and technology choices.

  3. You're a Software Engineer on the 'Grow Your Network' team. Users are complaining that their connection suggestions are irrelevant. What are the potential causes of this problem, and how would you go about diagnosing and fixing it from a code perspective? Consider data freshness, feature interactions, and potential algorithmic biases.

    Software EngineerCoding ReasoningTests: Tests coding logic, understanding of algorithms, and ability to connect code to user problems.

  4. LinkedIn's messaging system needs to support features like read receipts, typing indicators, and large group chats. Design the backend architecture for this system, focusing on efficiency, scalability, and real-time capabilities. How would you handle message ordering and delivery guarantees?

    Software EngineerSystem DesignTests: Evaluates design of real-time systems, concurrency, and handling of complex communication protocols.

  5. A/B testing is crucial for LinkedIn. Describe how you would set up and monitor an A/B test for a new feature that changes the layout of a user's profile page. What statistical methods would you use to determine significance, and what potential biases should you be aware of?

    Software EngineerA/B Testing & MetricsTests: Tests understanding of experimentation, statistical rigor, and awareness of A/B testing pitfalls.

  6. Imagine LinkedIn is experiencing high latency for search queries. Outline your strategy for debugging this performance issue. What tools and techniques would you employ to pinpoint the bottleneck in the search infrastructure?

    Software EngineerDebuggingTests: Assesses debugging skills in a performance-critical, large-scale system.

92+ more LinkedIn-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

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LinkedIn Interview Questions (2026) | ZorixOS