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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

← Arcesium

New Grad / Junior Backend at Arcesium

BackendNew Grad / JuniorOutcome unknown◆ Commonly asked· 2024

A junior backend loop. 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.

  • Count pairs with a given sum in an array.
    New Grad / JuniorEasy◆ Commonly asked
    #hashmap
    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↗
  • Permutations.
    New Grad / JuniorMedium◆ Commonly asked
    #backtracking
    PracticeLeetCode↗GeeksforGeeks↗
  • Maximum product subarray.
    New Grad / JuniorMedium◆ Commonly asked
    #array#dp
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a URL health checker with a concurrency limit.
    New Grad / JuniorMedium◆ Commonly asked
    #concurrency
    PracticeGeeksforGeeks↗Search↗
  • Build a background job runner with priorities.
    New Grad / JuniorMedium◆ Commonly asked
    #queue#workers
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • How do you design an idempotency-key system for payments?
    New Grad / JuniorHard◆ Commonly asked
    #idempotency#payments
    PracticeGeeksforGeeks↗Search↗
  • How does a write-ahead log guarantee durability?
    New Grad / JuniorHard◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
  • Explain connection pooling and why it matters.
    New Grad / JuniorMedium◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • When did you have to make a decision with incomplete data?
    New Grad / Junior◆ Commonly asked
    #judgment#star
  • Tell me about a time you failed and what you learned.
    New Grad / Junior◆ Commonly asked
    #growth#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.