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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

← ASML

New Grad / Junior Backend at ASML

BackendNew Grad / JuniorOffer◆ Commonly asked· 2023

5-round junior backend process. Fast-paced; expect follow-ups that push on depth.

The loop · 5 rounds

01

Round 01 · 1 question

Online Assessment

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

  • Longest common prefix among strings.
    New Grad / JuniorEasy◆ Commonly asked
    #string
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Maximum subarray (Kadane).
    New Grad / JuniorMedium◆ Commonly asked
    #array#dp
    PracticeLeetCode↗GeeksforGeeks↗
  • House robber.
    New Grad / JuniorMedium◆ Commonly asked
    #dp
    PracticeLeetCode↗GeeksforGeeks↗
  • Minimum window substring.
    New Grad / JuniorHard◆ Commonly asked
    #sliding-window#string
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Implement a leaderboard API backed by a sorted set.
    New Grad / JuniorMedium◆ Commonly asked
    #redis#ranking
    PracticeGeeksforGeeks↗Search↗
  • Implement a JSON config loader with env overrides.
    New Grad / JuniorEasy◆ Commonly asked
    #config
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain how you handle concurrency / race conditions.
    New Grad / JuniorHard◆ Commonly asked
    #concurrency
    PracticeGeeksforGeeks↗Search↗
  • How do you secure secrets and handle auth tokens?
    New Grad / JuniorMedium◆ Commonly asked
    #security
    PracticeGeeksforGeeks↗Search↗
  • How do you retry without amplifying load?
    New Grad / JuniorHard◆ Commonly asked
    #reliability
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Describe a goal you set and how you achieved it.
    New Grad / Junior◆ Commonly asked
    #ownership#star
  • Describe a disagreement on a code review and how it ended.
    New Grad / Junior◆ Commonly asked
    #conflict#star

Practice each round across every company

  • Online Assessment
  • DSA / Coding
  • Machine Coding
  • Tech Deep-Dive
  • 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.