ZorixOS
11+ Juspay questions

Juspay interview questions and how to prepare

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

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ZorixOS tracks 11 community-reported Juspay 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 Juspay's known interview style (not claimed as asked at Juspay), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Juspay.

Updated July 2026

Juspay interview questions candidates report

Community-reported from real Juspay interviews (open-source dataset), most-asked first. Showing 11. Each links to its source.

  1. Longest Cycle in a Graph
    Depth-First SearchBreadth-First SearchGraphTopological Sort
    Hard100% asked
  2. Longest Subsequence With Decreasing Adjacent Difference
    ArrayDynamic Programming
    Medium100% asked
  3. Operations on Tree
    ArrayHash TableTreeDepth-First Search
    Medium100% asked
  4. Find Closest Node to Given Two Nodes
    Depth-First SearchGraph
    Medium96% asked
  5. Node With Highest Edge Score
    Hash TableGraph
    Medium91% asked
  6. Largest Color Value in a Directed Graph
    Hash TableDynamic ProgrammingGraphTopological Sort
    Hard88% asked
  7. Shortest Path in a Weighted Tree
    ArrayTreeDepth-First SearchBinary Indexed Tree
    Hard88% asked
  8. Sliding Window Maximum
    ArrayQueueSliding WindowHeap (Priority Queue)
    Hard88% asked
  9. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium73% asked
  10. Set Matrix Zeroes
    ArrayHash TableMatrix
    Medium73% asked
  11. Word Ladder
    Hash TableStringBreadth-First Search
    Hard54% asked

Practice questions in Juspay's style

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

  1. Imagine a user is trying to complete a payment on a merchant website using Juspay. They report that the payment failed after selecting their bank. Describe the potential technical issues that could have occurred at the API gateway, the payment gateway integration layer, or the bank's system, and how you would debug this. Assume Juspay handles millions of transactions daily.

    Software EngineerDebugging and System UnderstandingTests: Assesses the candidate's ability to troubleshoot complex, high-volume distributed systems and their understanding of payment flows.

  2. Juspay's platform processes payments for numerous merchants. If a particular merchant experiences a sudden spike in payment failures (e.g., 5% failure rate from a usual 0.5%), how would you identify the root cause? Consider network latency, third-party gateway issues, card network problems, or Juspay's own infrastructure.

    Software EngineerSystem Monitoring and Incident ResponseTests: Evaluates the candidate's approach to identifying and resolving performance bottlenecks and failures in a production environment.

  3. Design a scalable and resilient caching mechanism for Juspay's payment gateway. The cache should store frequently accessed merchant configurations and user tokens. Consider cache invalidation strategies and how to handle cache misses to ensure low latency and high availability, especially during peak traffic.

    Software EngineerSystem DesignTests: Tests the candidate's knowledge of distributed caching patterns and their application in a high-throughput system.

  4. Write a Python function to detect duplicate transactions within a given time window for a specific merchant, given a stream of transaction data (merchant_id, transaction_id, timestamp). The function should be efficient enough to handle millions of transactions per hour.

    Software EngineerCoding and Data StructuresTests: Assesses coding proficiency, understanding of time/space complexity, and ability to handle large data streams.

  5. Describe how you would implement a rate limiting service for Juspay's API endpoints. Consider different algorithms (e.g., token bucket, leaky bucket) and how to distribute the rate limiting state across multiple servers to prevent abuse and ensure fair usage.

    Software EngineerSystem DesignTests: Evaluates the candidate's understanding of distributed systems principles and API security.

  6. A critical microservice responsible for transaction authorization experiences intermittent high latency, impacting payment success rates for a significant number of users. Outline your step-by-step approach to diagnose and resolve this issue in a production environment, considering dependencies and potential failures across the Juspay ecosystem.

    Software EngineerDebugging and Distributed SystemsTests: Tests the candidate's ability to systematically debug complex, interdependent microservices under pressure.

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

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Juspay Interview Questions (2026) | ZorixOS