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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

← PayPal

Senior Frontend at PayPal

FrontendSeniorRejected◆ Commonly asked· 2024

A senior frontend loop. Fundamentals mattered as much as getting to an answer.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Maximum depth of a binary tree.
    SeniorEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Kth smallest element in a BST.
    SeniorMedium◆ Commonly asked
    #tree#bst
    PracticeLeetCode↗GeeksforGeeks↗
  • Best time to buy and sell stock.
    SeniorEasy◆ Commonly asked
    #array#greedy
    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.
    SeniorHard◆ Commonly asked
    #react#table
    PracticeGeeksforGeeks↗Search↗
  • Build an image carousel with autoplay and swipe.
    SeniorMedium◆ Commonly asked
    #react#ui
    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 news feed / timeline.
    SeniorHard◆ Commonly asked
    #fanout#ranking#cache
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • What is the virtual DOM and why does it help?
    SeniorMedium◆ Commonly asked
    #react
    PracticeGeeksforGeeks↗Search↗
  • Explain `useEffect` dependencies and common pitfalls.
    SeniorMedium◆ Commonly asked
    #react#hooks
    PracticeGeeksforGeeks↗Search↗
  • What are Web Workers and when would you use one?
    SeniorMedium◆ Commonly asked
    #browser#perf
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 1 question

Hiring Manager

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

  • Tell me about a project that slipped. What did you do?
    Senior◆ Commonly asked
    #delivery
06

Round 06 · 2 questions

Behavioral / HR

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

  • When did you have to make a decision with incomplete data?
    Senior◆ Commonly asked
    #judgment#star
  • Describe mentoring or unblocking another engineer.
    Senior◆ Commonly asked
    #mentorship#star

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