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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

← Postman

New Grad / Junior Backend at Postman

BackendNew Grad / JuniorNo offer◆ Commonly asked· 2024

Junior backend interview. Coding-heavy early, design and behavioral later.

The loop · 5 rounds

01

Round 01 · 1 question

Online Assessment

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

  • Reformat a log file by timestamp.
    New Grad / JuniorEasy◆ Commonly asked
    #sorting#parsing
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Merge intervals.
    New Grad / JuniorMedium◆ Commonly asked
    #intervals#sorting
    PracticeLeetCode↗GeeksforGeeks↗
  • House robber.
    New Grad / JuniorMedium◆ Commonly asked
    #dp
    PracticeLeetCode↗GeeksforGeeks↗
  • Permutations.
    New Grad / JuniorMedium◆ Commonly asked
    #backtracking
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build an in-memory rate limiter as a middleware.
    New Grad / JuniorMedium◆ Commonly asked
    #rate-limit#middleware
    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 the OAuth 2.0 authorization-code flow work?
    New Grad / JuniorMedium◆ Commonly asked
    #auth#security
    PracticeGeeksforGeeks↗Search↗
  • Explain database indexing and when a query uses one.
    New Grad / JuniorMedium◆ Commonly asked
    #databases#indexing
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Why this company, and why this role?
    New Grad / Junior◆ Commonly asked
    #motivation
  • Describe a conflict with your manager and the outcome.
    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.