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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

← Cisco

Mid Frontend at Cisco

FrontendMidNo offer◆ Commonly asked· 2024

Mid frontend interview. Pragmatic questions — more real-world than pure puzzles.

The loop · 5 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Invert a binary tree.
    MidEasy◆ Commonly asked
    #tree
    PracticeLeetCode↗GeeksforGeeks↗
  • Longest substring without repeating characters.
    MidMedium◆ Commonly asked
    #sliding-window#string
    PracticeLeetCode↗GeeksforGeeks↗
  • Unique paths.
    MidMedium◆ Commonly asked
    #dp#grid
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a data table with sorting, filtering and pagination.
    MidHard◆ Commonly asked
    #react#table
    PracticeGeeksforGeeks↗Search↗
  • Build a nested, collapsible comment thread.
    MidMedium◆ Commonly asked
    #react#recursion
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 1 question

Low-Level Design

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

  • Design a client-side router.
    MidMedium◆ Commonly asked
    #oop#routing
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain prototypal inheritance.
    MidMedium◆ Commonly asked
    #javascript
    PracticeGeeksforGeeks↗Search↗
  • Explain the CSS box model and box-sizing.
    MidEasy◆ Commonly asked
    #css
    PracticeGeeksforGeeks↗Search↗
  • Explain WeakMap/WeakSet and when to use them.
    MidMedium◆ Commonly asked
    #javascript
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Tell me about a time you simplified something overly complex.
    Mid◆ Commonly asked
    #judgment#star
  • Tell me about the hardest bug you have debugged.
    Mid◆ Commonly asked
    #debugging#star

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