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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

← Block

New Grad / Junior Backend at Block

BackendNew Grad / JuniorOutcome unknown◆ Commonly asked· 2025

A junior backend loop. Balanced across coding, design, and collaboration.

The loop · 5 rounds

01

Round 01 · 1 question

Online Assessment

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

  • Merge overlapping meeting intervals from a calendar.
    New Grad / JuniorMedium◆ Commonly asked
    #intervals#sorting
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Search in a rotated sorted array.
    New Grad / JuniorMedium◆ Commonly asked
    #binary-search
    PracticeLeetCode↗GeeksforGeeks↗
  • Find minimum in rotated sorted array.
    New Grad / JuniorMedium◆ Commonly asked
    #binary-search
    PracticeLeetCode↗GeeksforGeeks↗
  • Group anagrams from a list of strings.
    New Grad / JuniorMedium◆ Commonly asked
    #hashmap#string
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Implement cursor-based pagination over a sorted dataset.
    New Grad / JuniorMedium◆ Commonly asked
    #pagination#api
    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.

  • Difference between at-least-once and exactly-once delivery.
    New Grad / JuniorHard◆ Commonly asked
    #messaging
    PracticeGeeksforGeeks↗Search↗
  • Caching strategies: cache-aside, write-through, TTLs.
    New Grad / JuniorMedium◆ Commonly asked
    #cache
    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.

  • Describe a goal you set and how you achieved it.
    New Grad / Junior◆ Commonly asked
    #ownership#star
  • Tell me about a time you disagreed and committed.
    New Grad / Junior◆ Commonly asked
    #teamwork#star

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