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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.

MIT · © 2026

← Zoom

Staff+ Backend at Zoom

BackendStaff+Outcome unknown◆ Commonly asked· 2023

Staff backend interview. 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.

  • Construct binary tree from preorder and inorder traversal.
    Staff+Medium◆ Commonly asked
    #tree#recursion
    PracticeLeetCode↗GeeksforGeeks↗
  • Maximum depth of a binary tree.
    Staff+Easy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Lowest common ancestor of a binary tree.
    Staff+Medium◆ Commonly asked
    #tree
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 1 question

Low-Level Design

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

  • Design a hotel-reservation system core.
    Staff+Medium◆ Commonly asked
    #oop#concurrency
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a leaderboard for millions of players.
    Staff+Medium◆ Commonly asked
    #redis#ranking
    PracticeGeeksforGeeks↗Search↗
  • Design a chat application like WhatsApp.
    Staff+Hard◆ Commonly asked
    #websocket#fanout#storage
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 1 question

Hiring Manager

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

  • How do you scope and staff a multi-month project?
    Staff+◆ Commonly asked
    #planning#leadership
05

Round 05 · 2 questions

Behavioral / HR

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

  • Tell me about receiving hard feedback and acting on it.
    Staff+◆ Commonly asked
    #feedback#star
  • Describe working with an ambiguous or shifting requirement.
    Staff+◆ Commonly asked
    #ambiguity#star

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