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9+ Persistent Systems questions

Persistent Systems interview questions and how to prepare

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

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ZorixOS tracks 9 community-reported Persistent Systems 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 Persistent Systems's known interview style (not claimed as asked at Persistent Systems), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Persistent Systems.

Updated July 2026

Persistent Systems interview questions candidates report

Community-reported from real Persistent Systems interviews (open-source dataset), most-asked first. Showing 9. Each links to its source.

  1. Longest Common Prefix
    ArrayStringTrie
    Easy100% asked
  2. Minimum Bit Flips to Convert Number
    Bit Manipulation
    Easy100% asked
  3. Group Anagrams
    ArrayHash TableStringSorting
    Medium93% asked
  4. Two Sum
    ArrayHash Table
    Easy93% asked
  5. Valid Parentheses
    StringStack
    Easy93% asked
  6. Longest Palindromic Substring
    Two PointersStringDynamic Programming
    Medium82% asked
  7. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium82% asked
  8. Maximum Subarray
    ArrayDivide and ConquerDynamic Programming
    Medium82% asked
  9. Merge Sorted Array
    ArrayTwo PointersSorting
    Easy82% asked

Practice questions in Persistent Systems's style

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

  1. Persistent Systems offers cloud migration and modernization services. Imagine a large enterprise client wants to migrate a monolithic Java application with a complex database to a microservices architecture on AWS. Outline your approach, focusing on potential challenges in data synchronization and inter-service communication. What tools or strategies would you consider for this migration?

    Software EngineerSystem DesignTests: Evaluates system design capabilities, understanding of cloud migration challenges, and architectural trade-offs in a complex enterprise context.

  2. You are tasked with debugging a performance degradation issue in a customer-facing application developed by Persistent Systems. Users are reporting slow response times during peak hours. Describe your systematic approach to identifying the root cause, considering potential bottlenecks in the application code, database, network, or infrastructure.

    Software EngineerDebuggingTests: Assesses systematic problem-solving and debugging skills in a performance-critical application.

  3. Persistent Systems works with clients on IoT solutions. Consider a scenario where a fleet management system needs to ingest real-time telemetry data from thousands of vehicles. Design a scalable and resilient data ingestion pipeline. What technologies would you recommend and why? How would you handle potential data loss or network interruptions?

    Software EngineerSystem DesignTests: Tests knowledge of distributed systems, real-time data processing, and fault tolerance in an IoT context.

  4. A client of Persistent Systems is experiencing intermittent failures in their distributed order processing system. Describe how you would approach debugging this issue. What logs would you look for, what metrics would you monitor, and what tools would you use to trace requests across different services?

    Software EngineerDebuggingTests: Evaluates debugging skills in a distributed systems environment and the ability to use observability tools.

  5. Persistent Systems develops custom software solutions for healthcare clients. Imagine you are building a feature for a patient portal that allows users to securely access their medical records. Discuss the security considerations and design patterns you would implement to ensure data privacy and compliance with regulations like HIPAA.

    Software EngineerSecurity and DesignTests: Assesses understanding of security best practices and designing secure software for regulated industries.

  6. Given a table of user interactions with a Persistent Systems product (e.g., clicks, page views, feature usage), write a SQL query to find the top 5 most frequently used features per user segment (e.g., new vs. returning users).

    Data ScientistSQLTests: Evaluates SQL proficiency for data extraction and basic segmentation.

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

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Persistent Systems Interview Questions (2026) | ZorixOS