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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

← Citadel

Senior Frontend at Citadel

FrontendSeniorNo offer◆ 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.

  • Lowest common ancestor of a binary tree.
    SeniorMedium◆ Commonly asked
    #tree
    PracticeLeetCode↗GeeksforGeeks↗
  • Word ladder — shortest transformation sequence.
    SeniorHard◆ Commonly asked
    #bfs#graph
    PracticeLeetCode↗GeeksforGeeks↗
  • Word search II.
    SeniorHard◆ Commonly asked
    #trie#backtracking
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a "connect four" game with win detection.
    SeniorMedium◆ Commonly asked
    #react#state
    PracticeGeeksforGeeks↗Search↗
  • Build a countdown timer with pause and resume.
    SeniorEasy◆ Commonly asked
    #react#state
    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 an offline-capable web app with sync.
    SeniorHard◆ Commonly asked
    #frontend#offline#sync
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain the difference between SSR, SSG, and ISR.
    SeniorMedium◆ Commonly asked
    #ssr#rendering
    PracticeGeeksforGeeks↗Search↗
  • Explain prototypal inheritance.
    SeniorMedium◆ Commonly asked
    #javascript
    PracticeGeeksforGeeks↗Search↗
  • Explain CORS and how a preflight request works.
    SeniorMedium◆ Commonly asked
    #browser#security
    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.

  • Describe working with an ambiguous or shifting requirement.
    Senior◆ Commonly asked
    #ambiguity#star
  • When did you take ownership of something outside your scope?
    Senior◆ 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.