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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

← Fiserv

Senior Backend at Fiserv

BackendSeniorNo offer◆ Commonly asked· 2024

A senior backend hiring drive. Fundamentals over puzzles — OOP, DBMS and SQL carried the most weight.

The loop · 4 rounds

01

Round 01 · 2 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Count vowels, consonants and words in a string.
    SeniorEasy◆ Commonly asked
    #string
    PracticeGeeksforGeeks↗Search↗
  • Remove duplicates from an array without using extra space.
    SeniorMedium◆ Commonly asked
    #array
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 4 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Difference between DBMS and RDBMS.
    SeniorEasy◆ Commonly asked
    #dbms
    PracticeGeeksforGeeks↗Search↗
  • What is a constructor? Explain constructor overloading.
    SeniorEasy◆ Commonly asked
    #oops
    PracticeGeeksforGeeks↗Search↗
  • Explain exception handling with try, catch and finally.
    SeniorEasy◆ Commonly asked
    #java
    PracticeGeeksforGeeks↗Search↗
  • Difference between stack and heap memory.
    SeniorEasy◆ Commonly asked
    #fundamentals
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

Hiring Manager

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

  • Describe your experience working with an onsite / offshore team.
    Senior◆ Commonly asked
  • What would you do if you disagreed with your project lead?
    Senior◆ Commonly asked
04

Round 04 · 3 questions

Behavioral / HR

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

  • What are your interests outside academics?
    Senior◆ Commonly asked
  • Tell me about yourself.
    Senior◆ Commonly asked
  • Do you have any backlogs or academic gaps? Please explain.
    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.