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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

← Whatfix

Mid Backend at Whatfix

BackendMidOffer◆ Commonly asked· 2025

A mid backend loop. Balanced across coding, design, and collaboration.

The loop · 5 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Min cost to connect all points.
    MidMedium◆ Commonly asked
    #graph#mst
    PracticeLeetCode↗GeeksforGeeks↗
  • Maximum product subarray.
    MidMedium◆ Commonly asked
    #array#dp
    PracticeLeetCode↗GeeksforGeeks↗
  • Diameter of a binary tree.
    MidEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Implement an exponential-backoff HTTP client.
    MidMedium◆ Commonly asked
    #reliability
    PracticeGeeksforGeeks↗Search↗
  • Implement a JSON config loader with env overrides.
    MidEasy◆ Commonly asked
    #config
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 1 question

Low-Level Design

Object-oriented / low-level design of a focused module.

  • Design a deck of cards + a card game.
    MidEasy◆ Commonly asked
    #oop
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • SQL vs NoSQL — how do you choose for a given workload?
    MidMedium◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
  • Explain database replication lag and how to mitigate it.
    MidMedium◆ Commonly asked
    #databases#replication
    PracticeGeeksforGeeks↗Search↗
  • Difference between at-least-once and exactly-once delivery.
    MidHard◆ Commonly asked
    #messaging
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Describe mentoring or unblocking another engineer.
    Mid◆ Commonly asked
    #mentorship#star
  • Describe a time you had to deliver bad news.
    Mid◆ Commonly asked
    #communication#star

Practice each round across every company

  • DSA / Coding
  • Machine Coding
  • Low-Level Design
  • 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.