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29+ Cognizant questions

Cognizant interview questions and how to prepare

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

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ZorixOS tracks 29 community-reported Cognizant 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 Cognizant's known interview style (not claimed as asked at Cognizant), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Cognizant.

Updated July 2026

Cognizant interview questions candidates report

Community-reported from real Cognizant interviews (open-source dataset), most-asked first. Showing 29. Each links to its source.

  1. Count Subarrays of Length Three With a Condition
    Array
    Easy100% asked
  2. Median of Two Sorted Arrays
    ArrayBinary SearchDivide and Conquer
    Hard100% asked
  3. Palindrome Number
    Math
    Easy100% asked
  4. Second Highest Salary
    Database
    Medium100% asked
  5. Smallest Value of the Rearranged Number
    MathSorting
    Medium96% asked
  6. Two Sum
    ArrayHash Table
    Easy83% asked
  7. Fibonacci Number
    MathDynamic ProgrammingRecursionMemoization
    Easy79% asked
  8. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium74% asked
  9. Valid Anagram
    Hash TableStringSorting
    Easy73% asked
  10. Longest Common Prefix
    StringTrie
    Easy71% asked
  11. Managers with at Least 5 Direct Reports
    Database
    Medium71% asked
  12. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium71% asked
  13. Reverse Integer
    Math
    Medium71% asked
  14. Product Sales Analysis I
    Database
    Easy67% asked
  15. Remove Duplicates from Sorted Array
    ArrayTwo Pointers
    Easy67% asked
  16. Valid Parentheses
    StringStack
    Easy67% asked
  17. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium65% asked
  18. 3Sum
    ArrayTwo PointersSorting
    Medium61% asked
  19. Add Two Numbers
    Linked ListMathRecursion
    Medium61% asked
  20. Binary Search
    ArrayBinary Search
    Easy61% asked
  21. Count Primes
    ArrayMathEnumerationNumber Theory
    Medium61% asked
  22. Happy Number
    Hash TableMathTwo Pointers
    Easy61% asked
  23. Merge Sorted Array
    ArrayTwo PointersSorting
    Easy61% asked
  24. Merge Two Sorted Lists
    Linked ListRecursion
    Easy61% asked
  25. Move Zeroes
    ArrayTwo Pointers
    Easy61% asked
  26. Fizz Buzz
    MathStringSimulation
    Easy57% asked
  27. Rising Temperature
    Database
    Easy57% asked
  28. Search Insert Position
    ArrayBinary Search
    Easy57% asked
  29. Students and Examinations
    Database
    Easy57% asked

Practice questions in Cognizant's style

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

  1. Imagine Cognizant is developing a new AI powered platform to help its clients automate compliance checks for financial regulations. How would you design the core data pipeline for ingesting and processing regulatory documents from various sources (e.g., PDFs, web pages, scanned documents) at scale, considering potential challenges like document variety and data quality?

    Software EngineerSystem DesignTests: Assesses system design capabilities, ability to handle large-scale data ingestion, and problem-solving for real-world data challenges.

  2. A client is experiencing performance issues with their existing Cognizant-developed customer relationship management (CRM) system, leading to slow load times for customer profiles. Debug this scenario: You've identified that a specific API call to retrieve customer interaction history is taking an unusually long time. What steps would you take to diagnose the root cause, and what are potential optimizations you might consider?

    Software EngineerDebuggingTests: Evaluates debugging skills, systematic problem-solving, and understanding of performance bottlenecks in a typical enterprise application.

  3. Write a Python function that efficiently takes a list of customer IDs and returns a list of their corresponding active support tickets from a hypothetical Cognizant internal ticketing system. Assume the system exposes an API that returns ticket data, but it might be slow if queried individually for each customer.

    Software EngineerCodingTests: Tests coding proficiency, efficiency in handling data retrieval, and algorithmic thinking for optimizing multiple API calls.

  4. Cognizant provides a platform for managing IT infrastructure for a large global enterprise. If a sudden spike in network traffic to this platform is observed, leading to increased latency, how would you approach troubleshooting this issue? Consider potential causes ranging from application issues to infrastructure problems.

    Software EngineerDebuggingTests: Assesses ability to diagnose complex, multi-layered technical issues in a distributed system environment.

  5. Design a microservice responsible for generating personalized client reports based on data from various business units within Cognizant. What would be the key APIs, data models, and potential scaling strategies for this service?

    Software EngineerSystem DesignTests: Evaluates understanding of microservice architecture, API design, data modeling, and scalability considerations for enterprise solutions.

  6. You are tasked with optimizing a database query in a Cognizant healthcare analytics solution that retrieves patient demographic data for a large hospital network. The current query is slow. How would you analyze and improve its performance?

    Software EngineerCodingTests: Tests database query optimization skills and understanding of SQL performance tuning.

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

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Cognizant Interview Questions (2026) | ZorixOS