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71+ ServiceNow questions

ServiceNow interview questions and how to prepare

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

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ZorixOS tracks 71 community-reported ServiceNow 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 ServiceNow's known interview style (not claimed as asked at ServiceNow), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to ServiceNow.

Updated July 2026

ServiceNow interview questions candidates report

Community-reported from real ServiceNow interviews (open-source dataset), most-asked first. Showing 60 of 71. Each links to its source.

  1. LRU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Medium100% asked
  2. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium95% asked
  3. Find Minimum Diameter After Merging Two Trees
    TreeDepth-First SearchBreadth-First SearchGraph Theory
    Hard95% asked
  4. Lexicographically Smallest String After Operations With Constraint
    StringGreedy
    Medium95% asked
  5. Number of Distinct Roll Sequences
    Dynamic ProgrammingMemoization
    Hard95% asked
  6. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard90% asked
  7. Maximum Score with Co-Prime Element
    ArrayHash TableMathCombinatorics
    Hard89% asked
  8. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion-Find
    Medium86% asked
  9. Generate Parentheses
    StringDynamic ProgrammingBacktracking
    Medium82% asked
  10. String Compression
    Two PointersString
    Medium82% asked
  11. Longest Repeating Character Replacement
    Hash TableStringSliding Window
    Medium77% asked
  12. Valid Parentheses
    StringStack
    Easy77% asked
  13. Best Time to Buy and Sell Stock II
    ArrayDynamic ProgrammingGreedy
    Medium72% asked
  14. Container With Most Water
    ArrayTwo PointersGreedy
    Medium72% asked
  15. First Missing Positive
    ArrayHash Table
    Hard72% asked
  16. Pacific Atlantic Water Flow
    ArrayDepth-First SearchBreadth-First SearchMatrix
    Medium72% asked
  17. Sliding Window Maximum
    ArrayQueueSliding WindowHeap (Priority Queue)
    Hard72% asked
  18. Asteroid Collision
    ArrayStackSimulation
    Medium71% asked
  19. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy64% asked
  20. Check if a Parentheses String Can Be Valid
    StringStackGreedy
    Medium64% asked
  21. Coin Change
    ArrayDynamic ProgrammingBreadth-First Search
    Medium64% asked
  22. Group Anagrams
    ArrayHash TableStringSorting
    Medium64% asked
  23. Jump Game II
    ArrayDynamic ProgrammingGreedy
    Medium64% asked
  24. Kth Largest Element in an Array
    ArrayDivide and ConquerSortingHeap (Priority Queue)
    Medium64% asked
  25. LFU Cache
    Hash TableLinked ListDesignDoubly-Linked List
    Hard64% asked
  26. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium64% asked
  27. Merge Two Sorted Lists
    Linked ListRecursion
    Easy64% asked
  28. Minimum Number of Swaps to Make the String Balanced
    Two PointersStringStackGreedy
    Medium64% asked
  29. Move Zeroes
    ArrayTwo Pointers
    Easy64% asked
  30. Number of Visible People in a Queue
    ArrayStackMonotonic Stack
    Hard64% asked
  31. Reverse Words in a String II
    Two PointersString
    Medium64% asked
  32. Set Matrix Zeroes
    ArrayHash TableMatrix
    Medium64% asked
  33. Two Sum
    ArrayHash Table
    Easy64% asked
  34. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium63% asked
  35. Rotting Oranges
    ArrayBreadth-First SearchMatrix
    Medium63% asked
  36. 4Sum
    ArrayTwo PointersSorting
    Medium54% asked
  37. Amount of Time for Binary Tree to Be Infected
    Hash TableTreeDepth-First SearchBreadth-First Search
    Medium54% asked
  38. Binary Tree Right Side View
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Medium54% asked
  39. Daily Temperatures
    ArrayStackMonotonic Stack
    Medium54% asked
  40. Find Peak Element
    ArrayBinary Search
    Medium54% asked
  41. Fruit Into Baskets
    ArrayHash TableSliding Window
    Medium54% asked
  42. Gas Station
    ArrayGreedy
    Medium54% asked
  43. House Robber II
    ArrayDynamic Programming
    Medium54% asked
  44. Largest Number
    ArrayStringGreedySorting
    Medium54% asked
  45. Letter Combinations of a Phone Number
    Hash TableStringBacktracking
    Medium54% asked
  46. Longest Common Subsequence
    StringDynamic Programming
    Medium54% asked
  47. Maximum Product Subarray
    ArrayDynamic Programming
    Medium54% asked
  48. Maximum Profit From Trading Stocks
    ArrayDynamic Programming
    Medium54% asked
  49. Median of Two Sorted Arrays
    ArrayBinary SearchDivide and Conquer
    Hard54% asked
  50. Merge Intervals
    ArraySorting
    Medium54% asked
  51. Minimum One Bit Operations to Make Integers Zero
    MathDynamic ProgrammingBit ManipulationRecursion
    Hard54% asked
  52. Next Greater Element II
    ArrayStackMonotonic Stack
    Medium54% asked
  53. Next Permutation
    ArrayTwo Pointers
    Medium54% asked
  54. Number of Distinct Islands
    ArrayHash TableDepth-First SearchBreadth-First Search
    Medium54% asked
  55. Palindrome Linked List
    Linked ListTwo PointersStackRecursion
    Easy54% asked
  56. Pow(x, n)
    MathRecursion
    Medium54% asked
  57. Reverse Linked List
    Linked ListRecursion
    Easy54% asked
  58. Reverse Words in a String
    Two PointersString
    Medium54% asked
  59. Simplify Path
    StringStack
    Medium54% asked
  60. Single Element in a Sorted Array
    ArrayBinary Search
    Medium54% asked

These are the 60 most-reported of 71 tracked ServiceNow questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in ServiceNow's style

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

  1. Imagine you are designing a new workflow automation for IT incident management on the ServiceNow platform. How would you handle potential race conditions if multiple agents try to update the same incident simultaneously? Describe your approach and potential solutions.

    Software EngineerConcurrency and Distributed SystemsTests: Assesses understanding of concurrency control mechanisms and their application in a complex enterprise system.

  2. ServiceNow handles vast amounts of data related to IT operations, HR, and customer service. How would you design a system to detect and alert on anomalous spikes in ticket creation volume for a specific service, considering potential false positives and the need for low latency?

    Software EngineerSystem Design and ScalabilityTests: Evaluates system design skills, ability to handle large scale data, and practical approach to anomaly detection.

  3. A customer reports that their custom ServiceNow application is experiencing slow performance when querying a large dataset. Walk me through your debugging process to identify the root cause, focusing on potential database, script, or configuration issues.

    Software EngineerDebugging and Performance TuningTests: Tests problem solving, systematic debugging, and knowledge of ServiceNow platform internals.

  4. ServiceNow uses a shared instance architecture. How would you design a mechanism to ensure that a poorly performing custom script in one customer's instance does not negatively impact other tenants on the same instance, from a platform stability perspective?

    Software EngineerMulti-tenancy and Performance IsolationTests: Probes understanding of multi-tenant architectures and strategies for resource isolation and performance guarantees.

  5. Describe how you would implement a real-time notification system within ServiceNow for critical security alerts. Consider the architecture, data flow, and technologies you might leverage.

    Software EngineerReal-time Systems and ArchitectureTests: Assesses knowledge of real-time processing, event-driven architectures, and system design for immediate feedback.

  6. You are tasked with building a feature that automatically categorizes incoming support tickets based on their content. What machine learning models would you consider, and what are the trade-offs for each in terms of accuracy, training time, and computational resources, especially given ServiceNow's scale?

    Software EngineerMachine Learning IntegrationTests: Explores the candidate's ability to integrate ML solutions into an enterprise platform and consider practical constraints.

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

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ServiceNow Interview Questions (2026) | ZorixOS