ZorixOS
228+ TCS questions

TCS interview questions and how to prepare

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

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ZorixOS tracks 228 community-reported TCS 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 TCS's known interview style (not claimed as asked at TCS), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to TCS.

Updated July 2026

TCS interview questions candidates report

Community-reported from real TCS interviews (open-source dataset), most-asked first. Showing 60 of 228. Each links to its source.

  1. Friday Purchases I
    Database
    Medium100% asked
  2. Two Sum
    ArrayHash Table
    Easy100% asked
  3. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium96% asked
  4. First Unique Character in a String
    Hash TableStringQueueCounting
    Easy94% asked
  5. Toeplitz Matrix
    ArrayMatrix
    Easy91% asked
  6. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium86% asked
  7. Move Zeroes
    ArrayTwo Pointers
    Easy86% asked
  8. Maximum Product Subarray
    ArrayDynamic Programming
    Medium82% asked
  9. Palindrome Number
    Math
    Easy82% asked
  10. Rotate Array
    ArrayMathTwo Pointers
    Medium77% asked
  11. Single Element in a Sorted Array
    ArrayBinary Search
    Medium77% asked
  12. Sort Colors
    ArrayTwo PointersSorting
    Medium77% asked
  13. Valid Anagram
    Hash TableStringSorting
    Easy77% asked
  14. Container With Most Water
    ArrayTwo PointersGreedy
    Medium77% asked
  15. Maximum Total Subarray Value I
    ArrayGreedy
    Medium77% asked
  16. Spiral Matrix
    ArrayMatrixSimulation
    Medium77% asked
  17. Find First and Last Position of Element in Sorted Array
    ArrayBinary Search
    Medium76% asked
  18. Maximum Depth of Binary Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy76% asked
  19. Minimum Depth of Binary Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy76% asked
  20. Palindrome Linked List
    Linked ListTwo PointersStackRecursion
    Easy76% asked
  21. Longest Common Prefix
    ArrayStringTrie
    Easy72% asked
  22. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium72% asked
  23. Squares of a Sorted Array
    ArrayTwo PointersSorting
    Easy72% asked
  24. Majority Element
    ArrayHash TableDivide and ConquerSorting
    Easy68% asked
  25. Contains Duplicate II
    ArrayHash TableSliding Window
    Easy66% asked
  26. Find Minimum in Rotated Sorted Array
    ArrayBinary Search
    Medium66% asked
  27. Find Numbers with Even Number of Digits
    ArrayMath
    Easy66% asked
  28. House Robber
    ArrayDynamic Programming
    Medium66% asked
  29. Maximum Ice Cream Bars
    ArrayGreedySortingCounting Sort
    Medium66% asked
  30. Median of Two Sorted Arrays
    ArrayBinary SearchDivide and Conquer
    Hard66% asked
  31. Product of Array Except Self
    ArrayPrefix Sum
    Medium66% asked
  32. Remove Duplicates from Sorted Array
    ArrayTwo Pointers
    Easy66% asked
  33. Reverse String
    Two PointersString
    Easy66% asked
  34. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy65% asked
  35. 3Sum
    ArrayTwo PointersSorting
    Medium64% asked
  36. Find the Index of the First Occurrence in a String
    Two PointersStringString Matching
    Easy64% asked
  37. Second Highest Salary
    Database
    Medium64% asked
  38. Single Number
    ArrayBit Manipulation
    Easy64% asked
  39. String to Integer (atoi)
    String
    Medium64% asked
  40. Subsets II
    ArrayBacktrackingBit Manipulation
    Medium64% asked
  41. Task Scheduler
    ArrayHash TableGreedySorting
    Medium64% asked
  42. Valid Parentheses
    StringStack
    Easy62% asked
  43. Subarray Sum Equals K
    ArrayHash TablePrefix Sum
    Medium61% asked
  44. Contains Duplicate
    ArrayHash TableSorting
    Easy57% asked
  45. Count the Digits That Divide a Number
    Math
    Easy57% asked
  46. Jump Game
    ArrayDynamic ProgrammingGreedy
    Medium57% asked
  47. Maximum Ascending Subarray Sum
    Array
    Easy57% asked
  48. Remove Letter To Equalize Frequency
    Hash TableStringCounting
    Easy57% asked
  49. Reverse Integer
    Math
    Medium57% asked
  50. Check if Array Is Sorted and Rotated
    Array
    Easy57% asked
  51. Zigzag Grid Traversal With Skip
    ArrayMatrixSimulation
    Easy57% asked
  52. Minimum Cuts to Divide a Circle
    MathGeometry
    Easy56% asked
  53. Minimum Operations to Exceed Threshold Value I
    Array
    Easy56% asked
  54. Minimum Operations to Exceed Threshold Value II
    ArrayHeap (Priority Queue)Simulation
    Medium56% asked
  55. Palindrome Partitioning IV
    StringDynamic Programming
    Hard56% asked
  56. Valid Palindrome
    Two PointersString
    Easy56% asked
  57. Add Two Numbers
    Linked ListMathRecursion
    Medium54% asked
  58. Contiguous Array
    ArrayHash TablePrefix Sum
    Medium54% asked
  59. Customer Who Visited but Did Not Make Any Transactions
    Database
    Easy54% asked
  60. Duplicate Emails
    Database
    Easy54% asked

These are the 60 most-reported of 228 tracked TCS questions. Create a free account to drill the full set with solutions and an AI interviewer.

Practice questions in TCS's style

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

  1. Imagine TCS is building a new cloud-native platform to manage its global consulting engagements. Describe the high level architecture, focusing on how you would handle multi-tenancy, data segregation, and scalability for millions of concurrent users and terabytes of data. What are the potential bottlenecks and how would you address them?

    Software EngineerSystem DesignTests: Evaluates ability to design scalable, resilient, and secure distributed systems considering enterprise-level requirements.

  2. TCS's AI.Reframe platform is designed to help clients accelerate their AI adoption. If you were tasked with building a new microservice for this platform that handles model deployment and monitoring, what technologies would you choose? Explain your reasoning, considering aspects like fault tolerance, performance, and ease of integration with existing services.

    Software EngineerSystem DesignTests: Assesses understanding of microservices architecture, technology selection trade-offs, and practical implementation considerations.

  3. You've identified a performance issue in a critical API gateway for TCS's customer portal, leading to timeouts. Given a snapshot of logs showing high latency for certain requests, how would you debug this problem? Outline your systematic approach to pinpoint the root cause, considering network, application, and infrastructure factors.

    Software EngineerDebuggingTests: Tests systematic problem-solving, debugging methodologies, and understanding of common performance bottlenecks in web applications.

  4. A TCS client is experiencing intermittent failures with their legacy ERP system, impacting order processing. You are given access to the system's codebase and server logs. Describe how you would approach debugging this issue. What tools and techniques would you employ?

    Software EngineerDebuggingTests: Evaluates debugging skills in a complex, legacy system context, including log analysis and potential code inspection.

  5. Consider TCS's extensive use of data analytics for financial services clients. If a client wants to build a real-time fraud detection system that processes millions of transactions per second, describe the data pipeline architecture. What are the key components and considerations for latency, throughput, and accuracy?

    Software EngineerSystem DesignTests: Assesses ability to design high-throughput, low-latency data processing systems for critical applications.

  6. TCS's banking solutions often involve integrating with numerous third-party APIs. Design a robust and scalable integration layer that can handle API versioning, error handling, and rate limiting. What design patterns would you use and why?

    Software EngineerSystem DesignTests: Tests knowledge of integration patterns, API management, and designing for extensibility and reliability.

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

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TCS Interview Questions (2026) | ZorixOS