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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

← Perplexity

New Grad / Junior Frontend at Perplexity

FrontendNew Grad / JuniorOutcome unknown◆ Commonly asked· 2023

5-round junior frontend process. Pragmatic questions — more real-world than pure puzzles.

The loop · 5 rounds

01

Round 01 · 1 question

Online Assessment

Timed online coding / aptitude screen, usually the first filter.

  • Find the missing number in 1..n.
    New Grad / JuniorEasy◆ Commonly asked
    #math
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • LRU cache with O(1) get and put.
    New Grad / JuniorMedium◆ Commonly asked
    #hashmap#linked-list
    PracticeLeetCode↗GeeksforGeeks↗
  • Kth smallest element in a BST.
    New Grad / JuniorMedium◆ Commonly asked
    #tree#bst
    PracticeLeetCode↗GeeksforGeeks↗
  • Construct binary tree from preorder and inorder traversal.
    New Grad / JuniorMedium◆ Commonly asked
    #tree#recursion
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build an image carousel with autoplay and swipe.
    New Grad / JuniorMedium◆ Commonly asked
    #react#ui
    PracticeGeeksforGeeks↗Search↗
  • Build a to-do app with filters and localStorage persistence.
    New Grad / JuniorEasy◆ Commonly asked
    #react#state
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • How do you prevent XSS in a React app?
    New Grad / JuniorMedium◆ Commonly asked
    #security#react
    PracticeGeeksforGeeks↗Search↗
  • How do you implement dark mode without a flash?
    New Grad / JuniorMedium◆ Commonly asked
    #css#ssr
    PracticeGeeksforGeeks↗Search↗
  • Explain the difference between SSR, SSG, and ISR.
    New Grad / JuniorMedium◆ Commonly asked
    #ssr#rendering
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Tell me about the most impactful project of your career.
    New Grad / Junior◆ Commonly asked
    #impact#star
  • Tell me about a time you had to say no to a stakeholder.
    New Grad / Junior◆ Commonly asked
    #influence#star

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