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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

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Mid Frontend at Pinterest

FrontendMidOutcome unknown◆ Commonly asked· 2023

A mid frontend loop. 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.

  • Merge k sorted lists.
    MidHard◆ Commonly asked
    #heap#linked-list
    PracticeLeetCode↗GeeksforGeeks↗
  • Maximum depth of a binary tree.
    MidEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Word ladder — shortest transformation sequence.
    MidHard◆ Commonly asked
    #bfs#graph
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a carousel/image slider.
    MidMedium◆ Commonly asked
    #react#ui
    PracticeGeeksforGeeks↗Search↗
  • Build a data table with sorting, filtering and pagination.
    MidHard◆ Commonly asked
    #react#table
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 1 question

Low-Level Design

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

  • Design an analytics event-tracking client.
    MidMedium◆ Commonly asked
    #oop#observability
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • How do you implement dark mode without a flash?
    MidMedium◆ Commonly asked
    #css#ssr
    PracticeGeeksforGeeks↗Search↗
  • Explain server components vs client components.
    MidHard◆ Commonly asked
    #react#ssr
    PracticeGeeksforGeeks↗Search↗
  • How do you prevent XSS in a React app?
    MidMedium◆ Commonly asked
    #security#react
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • When did you take ownership of something outside your scope?
    Mid◆ Commonly asked
    #ownership#star
  • How do you handle being blocked for several days?
    Mid◆ Commonly asked
    #ownership#star

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