ZorixOS
217+ Meta questions

Meta interview questions and how to prepare

Fast-paced and impact-obsessed: vague answers get cut off, ruthless prioritization wins. Below: the questions candidates report from Meta interviews, sorted by how often they come up, plus original practice in Meta's style.

Practice Meta questions free All companies

ZorixOS tracks 217 community-reported Meta 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 78 original ZorixOS practice questions written in Meta's known interview style (not claimed as asked at Meta), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Meta.

Updated July 2026

How Meta interviews run

What candidates consistently report about the loop, so nothing surprises you on the day.

  • Fast-paced and impact-obsessed: vague answers get cut off, ruthless prioritization wins.
  • PM loops lean on product sense and execution; engineering rounds want quick, clean signal.

Meta interview questions candidates report

Community-reported from real Meta interviews (open-source dataset), most-asked first. Showing 60 of 217. Each links to its source.

  1. Minimum Remove to Make Valid Parentheses
    StringStack
    Medium100% asked
  2. Valid Word Abbreviation
    Two PointersString
    Easy95% asked
  3. Kth Largest Element in an Array
    ArrayDivide and ConquerSortingHeap (Priority Queue)
    Medium94% asked
  4. Binary Tree Vertical Order Traversal
    Hash TableTreeDepth-First SearchBreadth-First Search
    Medium93% asked
  5. Valid Palindrome II
    Two PointersStringGreedy
    Easy93% asked
  6. Lowest Common Ancestor of a Binary Tree III
    Hash TableTwo PointersTreeBinary Tree
    Medium90% asked
  7. Merge Sorted Array
    ArrayTwo PointersSorting
    Easy89% asked
  8. Pow(x, n)
    MathRecursion
    Medium88% asked
  9. Diameter of Binary Tree
    TreeDepth-First SearchBinary Tree
    Easy87% asked
  10. Simplify Path
    StringStack
    Medium87% asked
  11. Basic Calculator II
    MathStringStack
    Medium86% asked
  12. Binary Tree Right Side View
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Medium86% asked
  13. Find Peak Element
    ArrayBinary Search
    Medium86% asked
  14. Merge Intervals
    ArraySorting
    Medium85% asked
  15. Buildings With an Ocean View
    ArrayStackMonotonic Stack
    Medium84% asked
  16. Lowest Common Ancestor of a Binary Tree
    TreeDepth-First SearchBinary Tree
    Medium84% asked
  17. Two Sum
    ArrayHash Table
    Easy84% asked
  18. Nested List Weight Sum
    Depth-First SearchBreadth-First Search
    Medium84% asked
  19. Random Pick with Weight
    ArrayMathBinary SearchPrefix Sum
    Medium83% asked
  20. Subarray Sum Equals K
    ArrayHash TablePrefix Sum
    Medium83% asked
  21. Valid Palindrome
    Two PointersString
    Easy82% asked
  22. 3Sum
    ArrayTwo PointersSorting
    Medium81% asked
  23. Sum Root to Leaf Numbers
    TreeDepth-First SearchBinary Tree
    Medium81% asked
  24. Next Permutation
    ArrayTwo Pointers
    Medium79% asked
  25. Shortest Path in Binary Matrix
    ArrayBreadth-First SearchMatrix
    Medium79% asked
  26. Copy List with Random Pointer
    Hash TableLinked List
    Medium79% asked
  27. Top K Frequent Elements
    ArrayHash TableDivide and ConquerSorting
    Medium79% asked
  28. Merge k Sorted Lists
    Linked ListDivide and ConquerHeap (Priority Queue)Merge Sort
    Hard77% asked
  29. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy76% asked
  30. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium76% asked
  31. Valid Parentheses
    StringStack
    Easy75% asked
  32. Custom Sort String
    Hash TableStringSorting
    Medium73% asked
  33. Making A Large Island
    ArrayDepth-First SearchBreadth-First SearchUnion Find
    Hard73% asked
  34. Find First and Last Position of Element in Sorted Array
    ArrayBinary Search
    Medium72% asked
  35. Range Sum of BST
    TreeDepth-First SearchBinary Search TreeBinary Tree
    Easy72% asked
  36. Clone Graph
    Hash TableDepth-First SearchBreadth-First SearchGraph
    Medium71% asked
  37. K Closest Points to Origin
    ArrayMathDivide and ConquerGeometry
    Medium71% asked
  38. Dot Product of Two Sparse Vectors
    ArrayHash TableTwo PointersDesign
    Medium71% asked
  39. Valid Number
    String
    Hard70% asked
  40. Moving Average from Data Stream
    ArrayDesignQueueData Stream
    Easy70% asked
  41. Minimum Window Substring
    Hash TableStringSliding Window
    Hard69% asked
  42. Minimum Add to Make Parentheses Valid
    StringStackGreedy
    Medium69% asked
  43. Max Consecutive Ones III
    ArrayBinary SearchSliding WindowPrefix Sum
    Medium68% asked
  44. Letter Combinations of a Phone Number
    Hash TableStringBacktracking
    Medium67% asked
  45. Longest Common Prefix
    StringTrie
    Easy67% asked
  46. Interval List Intersections
    ArrayTwo PointersLine Sweep
    Medium66% asked
  47. Add Two Numbers
    Linked ListMathRecursion
    Medium66% asked
  48. Kth Missing Positive Number
    ArrayBinary Search
    Easy66% asked
  49. Maximum Swap
    MathGreedy
    Medium66% asked
  50. Remove Nth Node From End of List
    Linked ListTwo Pointers
    Medium65% asked
  51. Subsets
    ArrayBacktrackingBit Manipulation
    Medium65% asked
  52. Sliding Window Median
    ArrayHash TableSliding WindowHeap (Priority Queue)
    Hard65% asked
  53. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium63% asked
  54. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard63% asked
  55. Accounts Merge
    ArrayHash TableStringDepth-First Search
    Medium62% asked
  56. Diagonal Traverse
    ArrayMatrixSimulation
    Medium62% asked
  57. Add Strings
    MathStringSimulation
    Easy60% asked
  58. String to Integer (atoi)
    String
    Medium60% asked
  59. Course Schedule
    Depth-First SearchBreadth-First SearchGraphTopological Sort
    Medium60% asked
  60. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium60% asked

These are the 60 most-reported of 217 tracked Meta questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in Meta's style

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

  1. Imagine Facebook's News Feed algorithm is showing a user significantly fewer posts from their close friends and family. Design an experiment to diagnose the root cause and propose potential solutions.

    Data ScientistExperimentation and Causal InferenceTests: Evaluates ability to design experiments to isolate causal factors in complex systems and propose actionable solutions.

  2. You are tasked with optimizing the performance of Instagram's Reels discovery algorithm. How would you define success metrics and what experiments would you run to improve user engagement?

    Data ScientistMetrics Definition and OptimizationTests: Assesses understanding of key metrics for content discovery platforms and experimental design for optimization.

  3. Meta is considering launching a new feature for WhatsApp that allows users to create short, ephemeral video messages that disappear after 24 hours, similar to Stories but within direct chats. How would you measure the success of this feature and what potential downsides do you foresee?

    Data ScientistProduct Metrics and Risk AssessmentTests: Tests the ability to define success metrics for new product features and anticipate potential negative impacts.

  4. Given the scale of Meta's infrastructure, how would you design a distributed system to reliably track and report real-time user engagement metrics across all its platforms (Facebook, Instagram, WhatsApp)?

    Software EngineerSystem Design ScalabilityTests: Evaluates system design skills for handling massive scale and real-time data processing.

  5. A critical service responsible for serving ads on Facebook is experiencing intermittent latency spikes. How would you approach debugging this issue in a production environment?

    Software EngineerDebugging Distributed SystemsTests: Assesses debugging methodology in a high-stakes, distributed environment.

  6. Design a notification system for Instagram that prioritizes personalized content updates (e.g., new posts from followed accounts, DMs) over less critical notifications (e.g., platform updates). Consider user control and potential overload.

    Software EngineerSystem Design NotificationsTests: Tests system design for personalized notification delivery at scale, balancing user experience and system load.

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

Keep exploring

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Meta Interview Questions (2026) | ZorixOS