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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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Senior Frontend at Pinterest

FrontendSeniorOffer◆ Commonly asked· 2023

A senior frontend loop. Fast-paced; expect follow-ups that push on depth.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Sliding window maximum.
    SeniorHard◆ Commonly asked
    #deque#sliding-window
    PracticeLeetCode↗GeeksforGeeks↗
  • Climbing stairs.
    SeniorEasy◆ Commonly asked
    #dp
    PracticeLeetCode↗GeeksforGeeks↗
  • Permutations.
    SeniorMedium◆ Commonly asked
    #backtracking
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a "polling" progress UI that updates from an API.
    SeniorMedium◆ Commonly asked
    #react#async
    PracticeGeeksforGeeks↗Search↗
  • Build a star-rating component (controlled + accessible).
    SeniorEasy◆ Commonly asked
    #react#a11y
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a Google Docs-style collaborative editor (frontend).
    SeniorHard◆ Commonly asked
    #frontend#crdt#realtime
    PracticeGeeksforGeeks↗Search↗
  • Design a notification system (push/email/SMS).
    SeniorMedium◆ Commonly asked
    #queues#fanout
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain `this` binding and the call/apply/bind trio.
    SeniorMedium◆ Commonly asked
    #javascript
    PracticeGeeksforGeeks↗Search↗
  • How does the browser critical rendering path work?
    SeniorMedium◆ Commonly asked
    #browser#perf
    PracticeGeeksforGeeks↗Search↗
  • Explain `useEffect` dependencies and common pitfalls.
    SeniorMedium◆ Commonly asked
    #react#hooks
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 1 question

Hiring Manager

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

  • Tell me about a technical bet that did not pay off.
    Senior◆ Commonly asked
    #risk#judgment
06

Round 06 · 2 questions

Behavioral / HR

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

  • How do you handle competing priorities from two managers?
    Senior◆ Commonly asked
    #prioritization#star
  • Tell me about receiving hard feedback and acting on it.
    Senior◆ Commonly asked
    #feedback#star

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