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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

Senior Backend at Persistent Systems

BackendSeniorOffer◆ Commonly asked· 2023

Campus-style senior backend interview. Breadth of fundamentals mattered more than algorithmic depth.

The loop · 4 rounds

01

Round 01 · 2 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Find the factorial of a number using recursion.
    SeniorEasy◆ Commonly asked
    #recursion
    PracticeGeeksforGeeks↗Search↗
  • Remove duplicate characters from a string.
    SeniorEasy◆ Commonly asked
    #string
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 4 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Difference between a process and a thread.
    SeniorEasy◆ Commonly asked
    #os
    PracticeGeeksforGeeks↗Search↗
  • Write a SQL query to find the second-highest salary.
    SeniorMedium◆ Commonly asked
    #sql
    PracticeGeeksforGeeks↗Search↗
  • Explain database normalization and its normal forms.
    SeniorMedium◆ Commonly asked
    #dbms
    PracticeGeeksforGeeks↗Search↗
  • Difference between an array and a linked list.
    SeniorEasy◆ Commonly asked
    #data-structures
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

Hiring Manager

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

  • How do you approach learning a technology you have never used?
    Senior◆ Commonly asked
  • How would you approach understanding a client's legacy codebase?
    Senior◆ Commonly asked
04

Round 04 · 3 questions

Behavioral / HR

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

  • How do you handle pressure and tight deadlines?
    Senior◆ Commonly asked
  • What do you know about our company and the services we provide?
    Senior◆ Commonly asked
  • Tell me about your final-year project.
    Senior◆ Commonly asked

Practice each round across every company

  • 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.