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Interview questions from top companies, mapped to the exact round they show up in. Prep for what you will actually face.

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Online AssessmentDSA / CodingMachine CodingLow-Level Design

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The Loop aggregates publicly shared interview experiences and curated commonly-asked questions, each labeled with its source. Not affiliated with any company listed.

CC BY-NC 4.0 · © 2026

← Persistent Systems

Mid Backend at Persistent Systems

BackendMidWithdrew◆ Commonly asked· 2025

5-round mid backend process. Basic programming plus core CS; communication mattered throughout.

The loop · 5 rounds

01

Round 01 · 3 questions

Online Assessment

Timed online coding / aptitude screen, usually the first filter.

  • Pseudocode: predict the output of the given code block.
    MidMedium◆ Commonly asked
    #pseudocode
    PracticeGeeksforGeeks↗Search↗
  • Quantitative aptitude: time and work problems.
    MidEasy◆ Commonly asked
    #aptitude
    PracticeGeeksforGeeks↗Search↗
  • Verbal ability: error spotting and sentence correction.
    MidEasy◆ Commonly asked
    #verbal
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 2 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Check whether two strings are anagrams.
    MidEasy◆ Commonly asked
    #string
    PracticeGeeksforGeeks↗Search↗
  • Reverse a number and check whether it is a palindrome.
    MidEasy◆ Commonly asked
    #math
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 4 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • What are the JDK, JRE and JVM?
    MidEasy◆ Commonly asked
    #java
    PracticeGeeksforGeeks↗Search↗
  • Difference between C and C++.
    MidEasy◆ Commonly asked
    #c
    PracticeGeeksforGeeks↗Search↗
  • What happens when you type a URL into a browser?
    MidMedium◆ Commonly asked
    #networking
    PracticeGeeksforGeeks↗Search↗
  • Explain the time complexity of common sorting algorithms.
    MidMedium◆ Commonly asked
    #data-structures
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 2 questions

Hiring Manager

Scope, ownership, and role-fit discussion with the manager.

  • How do you ensure code quality under a tight delivery timeline?
    Mid◆ Commonly asked
  • Tell me about a production issue you helped resolve.
    Mid◆ Commonly asked
05

Round 05 · 3 questions

Behavioral / HR

Values, collaboration, and past-experience (STAR) questions.

  • Do you have any backlogs or academic gaps? Please explain.
    Mid◆ Commonly asked
  • Would you be comfortable working on any technology assigned to you?
    Mid◆ Commonly asked
  • Why do you want to join our company?
    Mid◆ Commonly asked

Practice each round across every company

  • Online Assessment
  • DSA / Coding
  • Tech Deep-Dive
  • Hiring Manager
  • Behavioral / HR

◆ This experience is composed from commonly reported questions for this role and level. Real, individually-shared interviews will be layered in over time.