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351+ TikTok questions

TikTok interview questions and how to prepare

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

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ZorixOS tracks 351 community-reported TikTok 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 76 original ZorixOS practice questions written in TikTok's known interview style (not claimed as asked at TikTok), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to TikTok.

Updated July 2026

TikTok interview questions candidates report

Community-reported from real TikTok interviews (open-source dataset), most-asked first. Showing 60 of 351. Each links to its source.

  1. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium100% asked
  2. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium100% asked
  3. Longest Increasing Subsequence
    ArrayBinary SearchDynamic Programming
    Medium94% asked
  4. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium90% asked
  5. Course Schedule II
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium89% asked
  6. Number of Distinct Islands
    ArrayHash TableDepth-First SearchBreadth-First Search
    Medium89% asked
  7. Course Schedule
    Depth-First SearchBreadth-First SearchGraph TheoryTopological Sort
    Medium89% asked
  8. Longest Mountain in Array
    ArrayTwo PointersDynamic ProgrammingEnumeration
    Medium89% asked
  9. Path Sum III
    TreeDepth-First SearchBinary Tree
    Medium89% asked
  10. Reverse Nodes in k-Group
    Linked ListRecursion
    Hard89% asked
  11. Meeting Rooms II
    ArrayTwo PointersGreedySorting
    Medium88% asked
  12. Subarray With Elements Greater Than Varying Threshold
    ArrayStackUnion-FindMonotonic Stack
    Hard87% asked
  13. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard87% asked
  14. Merge Intervals
    ArraySorting
    Medium86% asked
  15. Text Justification
    ArrayStringSimulation
    Hard80% asked
  16. Decode String
    StringStackRecursion
    Medium78% asked
  17. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium78% asked
  18. Word Search
    ArrayStringBacktrackingDepth-First Search
    Medium78% asked
  19. Minimum Window Substring
    Hash TableStringSliding Window
    Hard77% asked
  20. N-Queens
    ArrayBacktracking
    Hard77% asked
  21. Gas Station
    ArrayGreedy
    Medium76% asked
  22. Possible Bipartition
    Depth-First SearchBreadth-First SearchUnion-FindGraph Theory
    Medium76% asked
  23. 3Sum
    ArrayTwo PointersSorting
    Medium75% asked
  24. Minimum Swaps to Group All 1's Together
    ArraySliding Window
    Medium74% asked
  25. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium74% asked
  26. Coin Change
    ArrayDynamic ProgrammingBreadth-First Search
    Medium73% asked
  27. Sqrt(x)
    MathBinary Search
    Easy73% asked
  28. Subarray Sum Equals K
    ArrayHash TablePrefix Sum
    Medium73% asked
  29. Top K Frequent Elements
    ArrayHash TableDivide and ConquerSorting
    Medium73% asked
  30. Making A Large Island
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Hard71% asked
  31. Maximum Value at a Given Index in a Bounded Array
    MathBinary SearchGreedy
    Medium71% asked
  32. Spiral Matrix
    ArrayMatrixSimulation
    Medium70% asked
  33. House Robber
    ArrayDynamic Programming
    Medium70% asked
  34. Longest Consecutive Sequence
    ArrayHash TableUnion-Find
    Medium70% asked
  35. Longest Happy String
    StringGreedyHeap (Priority Queue)
    Medium70% asked
  36. Maximum Swap
    MathGreedy
    Medium70% asked
  37. Merge k Sorted Lists
    Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
    Hard70% asked
  38. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy68% asked
  39. Basic Calculator II
    MathStringStack
    Medium68% asked
  40. Basic Calculator III
    MathStringStackRecursion
    Hard68% asked
  41. Snapshot Array
    ArrayHash TableBinary SearchDesign
    Medium68% asked
  42. Two Sum
    ArrayHash Table
    Easy68% asked
  43. Valid Parentheses
    StringStack
    Easy68% asked
  44. Kth Largest Element in an Array
    ArrayDivide and ConquerSortingHeap (Priority Queue)
    Medium67% asked
  45. Generate Parentheses
    StringDynamic ProgrammingBacktracking
    Medium66% asked
  46. Insert Delete GetRandom O(1)
    ArrayHash TableMathDesign
    Medium66% asked
  47. Word Ladder
    Hash TableStringBreadth-First Search
    Hard66% asked
  48. All O`one Data Structure
    Hash TableLinked ListDesignDoubly-Linked List
    Hard66% asked
  49. Cheapest Flights Within K Stops
    Dynamic ProgrammingDepth-First SearchBreadth-First SearchGraph Theory
    Medium66% asked
  50. Find First and Last Position of Element in Sorted Array
    ArrayBinary Search
    Medium66% asked
  51. Fruit Into Baskets
    ArrayHash TableSliding Window
    Medium66% asked
  52. Rotate Array
    ArrayMathTwo Pointers
    Medium66% asked
  53. Serialize and Deserialize N-ary Tree
    StringTreeDepth-First SearchBreadth-First Search
    Hard66% asked
  54. Subsets
    ArrayBacktrackingBit Manipulation
    Medium66% asked
  55. Daily Temperatures
    ArrayStackMonotonic Stack
    Medium64% asked
  56. Longest Increasing Path in a Matrix
    ArrayDynamic ProgrammingDepth-First SearchBreadth-First Search
    Hard64% asked
  57. Max Area of Island
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium64% asked
  58. Meeting Rooms III
    ArrayHash TableSortingHeap (Priority Queue)
    Hard64% asked
  59. Sort Colors
    ArrayTwo PointersSorting
    Medium64% asked
  60. Valid Parenthesis String
    StringDynamic ProgrammingStackGreedy
    Medium64% asked

These are the 60 most-reported of 351 tracked TikTok questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in TikTok's style

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

  1. Imagine you are optimizing the video feed ranking algorithm for TikTok. Given a sudden spike in engagement on a niche genre of videos, how would you approach debugging potential issues with the algorithm's ability to adapt and feature these new trends?

    Software EngineerDebuggingTests: Evaluates ability to diagnose complex algorithmic issues under high pressure and scale.

  2. Design a system to efficiently serve personalized video recommendations to millions of concurrent users on TikTok, considering low latency and high throughput. What are the key components, data flows, and trade-offs?

    Software EngineerSystem DesignTests: Assesses design thinking, scalability considerations, and familiarity with large-scale distributed systems.

  3. You've noticed a consistent bug where certain video effects crash the app for a subset of Android users. How would you investigate the root cause and what steps would you take to fix it?

    Software EngineerDebuggingTests: Tests problem-solving skills and systematic debugging approaches in a mobile app context.

  4. Given TikTok's massive video upload volume, how would you design a distributed system for video transcoding and storage that is both cost-effective and ensures high availability?

    Software EngineerSystem DesignTests: Probes understanding of distributed storage, media processing, and cost optimization at scale.

  5. A new feature is introduced that allows users to add interactive polls to their videos. How would you design the backend infrastructure to handle the real-time submission and display of poll results across potentially millions of viewers?

    Software EngineerSystem DesignTests: Evaluates ability to design real-time systems and handle high concurrency for interactive features.

  6. Imagine a scenario where a popular creator's video is being widely reported for potentially violating community guidelines. How would you design a system to flag, review, and take action on such content at scale, balancing speed and accuracy?

    Software EngineerSystem DesignTests: Tests understanding of content moderation systems, real-time processing, and fairness considerations.

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

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TikTok Interview Questions (2026) | ZorixOS