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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

← Mastercard

New Grad / Junior Frontend at Mastercard

FrontendNew Grad / JuniorOffer◆ Commonly asked· 2024

5-round junior frontend process. Fundamentals mattered as much as getting to an answer.

The loop · 5 rounds

01

Round 01 · 1 question

Online Assessment

Timed online coding / aptitude screen, usually the first filter.

  • Compute the running median of a stream.
    New Grad / JuniorHard◆ Commonly asked
    #heap
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Serialize and deserialize a binary tree.
    New Grad / JuniorHard◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Maximum product subarray.
    New Grad / JuniorMedium◆ Commonly asked
    #array#dp
    PracticeLeetCode↗GeeksforGeeks↗
  • Longest substring without repeating characters.
    New Grad / JuniorMedium◆ Commonly asked
    #sliding-window#string
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a toast / notification queue.
    New Grad / JuniorMedium◆ Commonly asked
    #react#state
    PracticeGeeksforGeeks↗Search↗
  • Build a data table with sorting, filtering and pagination.
    New Grad / JuniorHard◆ Commonly asked
    #react#table
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain the JS event loop: microtasks vs macrotasks.
    New Grad / JuniorMedium◆ Commonly asked
    #javascript#event-loop
    PracticeGeeksforGeeks↗Search↗
  • Explain server components vs client components.
    New Grad / JuniorHard◆ Commonly asked
    #react#ssr
    PracticeGeeksforGeeks↗Search↗
  • Closures and the module pattern — with an example.
    New Grad / JuniorEasy◆ Commonly asked
    #javascript#closures
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Tell me about a time you simplified something overly complex.
    New Grad / Junior◆ Commonly asked
    #judgment#star
  • Describe a time you disagreed with a teammate. How did it resolve?
    New Grad / Junior◆ Commonly asked
    #conflict#star

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