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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

Intern Full-stack at Persistent Systems

Full-stackInternOutcome unknown◆ Commonly asked· 2025

Campus-style intern fullstack interview. Basic programming plus core CS; communication mattered throughout.

The loop · 4 rounds

01

Round 01 · 3 questions

Online Assessment

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

  • Email writing / essay writing task.
    InternEasy◆ Commonly asked
    #verbal
    PracticeGeeksforGeeks↗Search↗
  • Quantitative aptitude: time, speed and distance problems.
    InternEasy◆ Commonly asked
    #aptitude
    PracticeGeeksforGeeks↗Search↗
  • Logical reasoning: blood relations and seating arrangement.
    InternMedium◆ Commonly asked
    #reasoning
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 2 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Check whether a number is an Armstrong number.
    InternEasy◆ Commonly asked
    #math
    PracticeGeeksforGeeks↗Search↗
  • Count the frequency of each character in a string.
    InternEasy◆ Commonly asked
    #string
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 4 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain the layers of the OSI model.
    InternEasy◆ Commonly asked
    #networking
    PracticeGeeksforGeeks↗Search↗
  • Difference between stack and heap memory.
    InternEasy◆ Commonly asked
    #fundamentals
    PracticeGeeksforGeeks↗Search↗
  • Difference between an abstract class and an interface.
    InternMedium◆ Commonly asked
    #oops
    PracticeGeeksforGeeks↗Search↗
  • Difference between abstraction and encapsulation.
    InternEasy◆ Commonly asked
    #oops
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Behavioral / HR

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

  • Tell me about yourself.
    Intern◆ Commonly asked
  • Are you willing to relocate anywhere in India?
    Intern◆ Commonly asked
  • What are your interests outside academics?
    Intern◆ Commonly asked

Practice each round across every company

  • Online Assessment
  • DSA / Coding
  • Tech Deep-Dive
  • 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.