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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

← redBus

Senior Frontend at redBus

FrontendSeniorWithdrew◆ Commonly asked· 2023

6-round senior frontend process. 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.

  • Construct binary tree from preorder and inorder traversal.
    SeniorMedium◆ Commonly asked
    #tree#recursion
    PracticeLeetCode↗GeeksforGeeks↗
  • Subtree of another tree.
    SeniorEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Rotting oranges.
    SeniorMedium◆ Commonly asked
    #bfs#grid
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a typeahead with in-flight request cancellation.
    SeniorMedium◆ Commonly asked
    #react#async
    PracticeGeeksforGeeks↗Search↗
  • Build a carousel/image slider.
    SeniorMedium◆ Commonly asked
    #react#ui
    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).
    SeniorHard◆ Commonly asked
    #frontend#virtualization#cache
    PracticeGeeksforGeeks↗Search↗
  • Design a ride-sharing service like Uber.
    SeniorHard◆ Commonly asked
    #geospatial#matching
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain hydration and the cost of client vs server rendering.
    SeniorHard◆ Commonly asked
    #ssr#perf
    PracticeGeeksforGeeks↗Search↗
  • How do you optimize a slow React app? (profiling → fixes)
    SeniorHard◆ Commonly asked
    #react#perf
    PracticeGeeksforGeeks↗Search↗
  • Explain how CSS-in-JS differs from utility CSS.
    SeniorEasy◆ Commonly asked
    #css
    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.

  • Describe something you shipped that you were not proud of.
    Senior◆ Commonly asked
    #tradeoffs#star
  • Describe a time you had to deliver bad news.
    Senior◆ Commonly asked
    #communication#star

Practice each round across every company

  • DSA / Coding
  • Machine Coding
  • System Design
  • Tech Deep-Dive
  • 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.