ZorixOS
29+ Paytm questions

Paytm interview questions and how to prepare

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

Practice Paytm questions free All companies

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

Updated July 2026

Paytm interview questions candidates report

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

  1. Find Indices With Index and Value Difference I
    ArrayTwo Pointers
    Easy100% asked
  2. Find Indices With Index and Value Difference II
    ArrayTwo Pointers
    Medium100% asked
  3. Longest Nice Subarray
    ArrayBit ManipulationSliding Window
    Medium100% asked
  4. Min Stack
    StackDesign
    Medium100% asked
  5. Minimize Maximum of Array
    ArrayBinary SearchDynamic ProgrammingGreedy
    Medium100% asked
  6. Number of Unequal Triplets in Array
    ArrayHash TableSorting
    Easy100% asked
  7. Remove All Adjacent Duplicates In String
    StringStack
    Easy100% asked
  8. Linked List Cycle II
    Hash TableLinked ListTwo Pointers
    Medium95% asked
  9. Number of Divisible Substrings
    Hash TableStringCountingPrefix Sum
    Medium95% asked
  10. Lexicographically Smallest String After Deleting Duplicate Characters
    Hash TableStringStackGreedy
    Hard94% asked
  11. Maximum Transactions Without Negative Balance
    ArrayGreedyHeap (Priority Queue)
    Medium94% asked
  12. Longest Consecutive Sequence
    ArrayHash TableUnion-Find
    Medium89% asked
  13. Search in Rotated Sorted Array
    ArrayBinary Search
    Medium81% asked
  14. Trapping Rain Water
    ArrayTwo PointersDynamic ProgrammingStack
    Hard81% asked
  15. Valid Parentheses
    StringStack
    Easy81% asked
  16. Burst Balloons
    ArrayDynamic Programming
    Hard70% asked
  17. Car Pooling
    ArraySortingHeap (Priority Queue)Simulation
    Medium70% asked
  18. Container With Most Water
    ArrayTwo PointersGreedy
    Medium70% asked
  19. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium70% asked
  20. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium70% asked
  21. Remove Duplicate Letters
    StringStackGreedyMonotonic Stack
    Medium70% asked
  22. Reverse Linked List
    Linked ListRecursion
    Easy70% asked
  23. String Compression
    Two PointersString
    Medium70% asked
  24. Two Sum
    ArrayHash Table
    Easy70% asked
  25. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy59% asked
  26. Execute Asynchronous Functions in Parallel
    Medium59% asked
  27. Find the Duplicate Number
    ArrayTwo PointersBinary SearchBit Manipulation
    Medium59% asked
  28. Search a 2D Matrix
    ArrayBinary SearchMatrix
    Medium59% asked
  29. Ugly Number II
    Hash TableMathDynamic ProgrammingHeap (Priority Queue)
    Medium59% asked

Practice questions in Paytm's style

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

  1. Imagine you're optimizing the payment processing flow for Paytm. A user is experiencing intermittent failures when trying to pay merchants via UPI. Describe how you would debug this issue, considering the scale of millions of transactions per day. What metrics would you monitor?

    Software EngineerDebugging & PerformanceTests: Evaluates debugging skills, understanding of distributed systems, and ability to identify critical metrics under pressure.

  2. Paytm's UPI system handles massive transaction volumes. How would you design a system to ensure idempotency for UPI transactions, preventing duplicate charges to users while maintaining high availability?

    Software EngineerSystem DesignTests: Tests understanding of distributed systems concepts, fault tolerance, and idempotency in financial transactions.

  3. A sudden spike in failed transactions on Paytm's credit card payment gateway is observed. Walk me through the potential causes and how you would systematically investigate them, from the client-side to the bank's processing.

    Software EngineerDebugging & Root Cause AnalysisTests: Assesses analytical thinking, systematic problem-solving, and knowledge of payment infrastructure.

  4. Paytm is considering integrating a new feature allowing users to invest in micro-mutual funds directly within the app. What are the key technical considerations for building this feature, focusing on security, scalability, and real-time updates?

    Software EngineerSystem DesignTests: Evaluates ability to design scalable and secure systems for new financial product integrations.

  5. How would you design a notification system for Paytm that can handle sending millions of personalized alerts (e.g., bill payment reminders, cashback offers) per hour, ensuring timely delivery and minimizing server load?

    Software EngineerSystem DesignTests: Tests design skills for high-throughput, real-time messaging systems.

  6. Write a SQL query to find the top 5 merchants on Paytm by the total transaction value in the last month, excluding any transactions that were marked as fraudulent.

    Software EngineerCoding & SQLTests: Measures SQL proficiency and ability to handle basic data filtering and aggregation.

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

Keep exploring

Can you answer these out loud, under Paytm-style follow-ups?

The ZorixOS AI interviewer runs a Paytm-tuned mock interview: it asks these kinds of questions, digs into your answers, and scores you against a real hiring bar. Your first one is free.

Start your Paytm mock interview
Paytm Interview Questions (2026) | ZorixOS