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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

← Slack

Senior Frontend at Slack

FrontendSeniorNo offer◆ Commonly asked· 2024

A senior frontend loop. Balanced across coding, design, and collaboration.

The loop · 6 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Largest rectangle in histogram.
    SeniorHard◆ Commonly asked
    #stack#monotonic-stack
    PracticeLeetCode↗GeeksforGeeks↗
  • Meeting rooms II — minimum rooms required.
    SeniorMedium◆ Commonly asked
    #heap#intervals
    PracticeLeetCode↗GeeksforGeeks↗
  • Longest increasing subsequence.
    SeniorHard◆ Commonly asked
    #dp#binary-search
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a modal/dialog with focus trapping.
    SeniorMedium◆ Commonly asked
    #react#a11y
    PracticeGeeksforGeeks↗Search↗
  • Build a debounced autocomplete/search box with keyboard nav.
    SeniorMedium◆ Commonly asked
    #react#debounce#a11y
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 2 questions

System Design

High-level architecture of a large-scale system.

  • Design a web crawler.
    SeniorHard◆ Commonly asked
    #queues#dedup#scale
    PracticeGeeksforGeeks↗Search↗
  • Design a component/design-system architecture for many teams.
    SeniorMedium◆ Commonly asked
    #frontend#design-system
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Closures and the module pattern — with an example.
    SeniorEasy◆ Commonly asked
    #javascript#closures
    PracticeGeeksforGeeks↗Search↗
  • Explain the difference between SSR, SSG, and ISR.
    SeniorMedium◆ Commonly asked
    #ssr#rendering
    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.

  • How do you set technical direction for a team?
    Senior◆ Commonly asked
    #leadership#strategy
06

Round 06 · 2 questions

Behavioral / HR

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

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

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