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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

← Pinecone

Staff+ Frontend at Pinecone

FrontendStaff+No offer◆ Commonly asked· 2023

5-round staff frontend process. Coding-heavy early, design and behavioral later.

The loop · 5 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Rotate array.
    Staff+Medium◆ Commonly asked
    #array
    PracticeLeetCode↗GeeksforGeeks↗
  • Merge intervals.
    Staff+Medium◆ Commonly asked
    #intervals#sorting
    PracticeLeetCode↗GeeksforGeeks↗
  • Binary tree level order traversal.
    Staff+Medium◆ Commonly asked
    #tree#bfs
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 1 question

Low-Level Design

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

  • Design a data-fetching cache with invalidation.
    Staff+Hard◆ Commonly asked
    #cache#oop
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a scalable frontend for an infinite feed (data, caching, rendering).
    Staff+Hard◆ Commonly asked
    #frontend#virtualization#cache
    PracticeGeeksforGeeks↗Search↗
  • Design a URL shortener like TinyURL.
    Staff+Medium◆ Commonly asked
    #hashing#cache#sharding
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 1 question

Hiring Manager

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

  • How do you grow junior engineers on your team?
    Staff+◆ Commonly asked
    #mentorship#leadership
05

Round 05 · 2 questions

Behavioral / HR

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

  • Describe something you shipped that you were not proud of.
    Staff+◆ Commonly asked
    #tradeoffs#star
  • A time you made a mistake in production — what happened next?
    Staff+◆ Commonly asked
    #ownership#star

Practice each round across every company

  • DSA / Coding
  • Low-Level Design
  • System Design
  • Hiring Manager
  • Behavioral / HR

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