ZorixOS
105+ PayPal questions

PayPal interview questions and how to prepare

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

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ZorixOS tracks 105 community-reported PayPal 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 PayPal's known interview style (not claimed as asked at PayPal), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to PayPal.

Updated July 2026

PayPal interview questions candidates report

Community-reported from real PayPal interviews (open-source dataset), most-asked first. Showing 60 of 105. Each links to its source.

  1. Longest Increasing Subsequence
    ArrayBinary SearchDynamic Programming
    Medium100% asked
  2. Minimum Absolute Difference
    ArraySorting
    Easy100% asked
  3. Zigzag Conversion
    String
    Medium100% asked
  4. Pythagorean Distance Nodes in a Tree
    TreeBreadth-First Search
    Medium88% asked
  5. Top K Frequent Elements
    ArrayHash TableDivide and ConquerSorting
    Medium88% asked
  6. Count Vowel Strings in Ranges
    ArrayStringPrefix Sum
    Medium83% asked
  7. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium83% asked
  8. Find Words That Can Be Formed by Characters
    ArrayHash TableStringCounting
    Easy81% asked
  9. Maximum Frequency Score of a Subarray
    ArrayHash TableMathStack
    Hard79% asked
  10. Maximum Number of Integers to Choose From a Range I
    ArrayHash TableBinary SearchGreedy
    Medium79% asked
  11. Meeting Scheduler
    ArrayTwo PointersSorting
    Medium79% asked
  12. Time Needed to Rearrange a Binary String
    StringDynamic ProgrammingSimulation
    Medium79% asked
  13. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium78% asked
  14. Word Search
    ArrayStringBacktrackingDepth-First Search
    Medium78% asked
  15. Count Array Pairs Divisible by K
    ArrayHash TableMathCounting
    Hard77% asked
  16. Count the Number of Vowel Strings in Range
    ArrayStringCounting
    Easy77% asked
  17. Maximum Number of Integers to Choose From a Range II
    ArrayBinary SearchGreedySorting
    Medium77% asked
  18. Maximum Sum Obtained of Any Permutation
    ArrayGreedySortingPrefix Sum
    Medium77% asked
  19. Minimum Non-Zero Product of the Array Elements
    MathGreedyRecursion
    Medium77% asked
  20. Number of Valid Move Combinations On Chessboard
    ArrayStringBacktrackingSimulation
    Hard77% asked
  21. Paint House III
    ArrayDynamic Programming
    Hard77% asked
  22. Smallest Greater Multiple Made of Two Digits
    MathEnumeration
    Medium77% asked
  23. Maximal Square
    ArrayDynamic ProgrammingMatrix
    Medium76% asked
  24. Product of Array Except Self
    ArrayPrefix Sum
    Medium74% asked
  25. Coin Change
    ArrayDynamic ProgrammingBreadth-First Search
    Medium73% asked
  26. Merge Intervals
    ArraySorting
    Medium70% asked
  27. Two Sum
    ArrayHash Table
    Easy70% asked
  28. Group Anagrams
    ArrayHash TableStringSorting
    Medium69% asked
  29. Find the Smallest Divisor Given a Threshold
    ArrayBinary Search
    Medium67% asked
  30. Last Stone Weight
    ArrayHeap (Priority Queue)
    Easy67% asked
  31. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy65% asked
  32. Find Median from Data Stream
    Two PointersDesignSortingHeap (Priority Queue)
    Hard65% asked
  33. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium65% asked
  34. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium65% asked
  35. Maximum Number of Events That Can Be Attended
    ArrayGreedySortingHeap (Priority Queue)
    Medium63% asked
  36. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium63% asked
  37. Pairs of Songs With Total Durations Divisible by 60
    ArrayHash TableCounting
    Medium63% asked
  38. Asteroid Collision
    ArrayStackSimulation
    Medium61% asked
  39. House Robber
    ArrayDynamic Programming
    Medium61% asked
  40. 3Sum Smaller
    ArrayTwo PointersBinary SearchSorting
    Medium57% asked
  41. Longest Consecutive Sequence
    ArrayHash TableUnion-Find
    Medium57% asked
  42. Random Pick with Weight
    ArrayMathBinary SearchPrefix Sum
    Medium57% asked
  43. Smallest String With Swaps
    ArrayHash TableStringDepth-First Search
    Medium57% asked
  44. Palindromic Substrings
    Two PointersStringDynamic Programming
    Medium56% asked
  45. Subarray Sum Equals K
    ArrayHash TablePrefix Sum
    Medium56% asked
  46. Valid Sudoku
    ArrayHash TableMatrix
    Medium56% asked
  47. Container With Most Water
    ArrayTwo PointersGreedy
    Medium51% asked
  48. Count Vowel Substrings of a String
    Hash TableString
    Easy51% asked
  49. Degree of an Array
    ArrayHash Table
    Easy51% asked
  50. Find Peak Element
    ArrayBinary Search
    Medium51% asked
  51. Koko Eating Bananas
    ArrayBinary Search
    Medium51% asked
  52. Loud and Rich
    ArrayDepth-First SearchGraph TheoryTopological Sort
    Medium51% asked
  53. Minimum Increment to Make Array Unique
    ArrayGreedySortingCounting
    Medium51% asked
  54. Reaching Points
    Math
    Hard51% asked
  55. Spiral Matrix
    ArrayMatrixSimulation
    Medium51% asked
  56. Subsets
    ArrayBacktrackingBit Manipulation
    Medium51% asked
  57. Top K Frequent Words
    ArrayHash TableStringTrie
    Medium51% asked
  58. Average Selling Price
    Database
    Easy49% asked
  59. LFU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Hard49% asked
  60. Remove All Adjacent Duplicates in String II
    StringStack
    Medium49% asked

These are the 60 most-reported of 105 tracked PayPal questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in PayPal's style

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

  1. Imagine a scenario where PayPal's cross-border payment system experiences a sudden surge in transaction failures for users in Brazil. Describe how you would approach debugging this issue, considering the distributed nature of the system and potential network latency.

    Software EngineerDebuggingTests: Evaluates problem-solving skills in a high-pressure, distributed systems environment relevant to PayPal's core business.

  2. Design a system to handle real-time fraud detection for PayPal transactions. Consider factors like low latency, high throughput, and the ability to adapt to new fraud patterns. What are the key components and trade-offs?

    Software EngineerSystem DesignTests: Assesses the candidate's ability to design scalable, resilient, and performant systems for a critical PayPal function.

  3. A user reports that their PayPal balance is not updating correctly after a recent transaction. Walk through your thought process to identify the root cause, from tracing the transaction lifecycle to checking potential data inconsistencies.

    Software EngineerDebuggingTests: Tests logical reasoning and systematic debugging skills in a user-facing scenario.

  4. PayPal is considering adding a 'buy now, pay later' feature for small business owners on its platform. Outline the technical challenges and considerations for integrating such a feature, focusing on credit risk assessment and repayment tracking.

    Software EngineerSystem DesignTests: Probes understanding of integrating complex financial products into existing infrastructure and associated risks.

  5. How would you optimize a critical API endpoint in PayPal's Payouts service to reduce latency by 50ms? Discuss potential bottlenecks and strategies for improvement.

    Software EngineerPerformance OptimizationTests: Evaluates knowledge of performance tuning and optimization techniques in a high-demand API context.

  6. You are tasked with implementing a feature that allows users to split a PayPal transaction with friends. Describe the data model you would use to represent the split payments and the logic for reconciling them.

    Software EngineerData Modeling/CodingTests: Assesses data modeling skills and ability to translate requirements into code logic.

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

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PayPal Interview Questions (2026) | ZorixOS