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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

← Carta

New Grad / Junior Backend at Carta

BackendNew Grad / JuniorOffer◆ Commonly asked· 2023

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.

  • Spiral order traversal of a matrix.
    New Grad / JuniorMedium◆ Commonly asked
    #matrix
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Invert a binary tree.
    New Grad / JuniorEasy◆ Commonly asked
    #tree
    PracticeLeetCode↗GeeksforGeeks↗
  • Meeting rooms II — minimum rooms required.
    New Grad / JuniorMedium◆ Commonly asked
    #heap#intervals
    PracticeLeetCode↗GeeksforGeeks↗
  • Unique paths.
    New Grad / JuniorMedium◆ Commonly asked
    #dp#grid
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a CSV importer that streams and validates rows.
    New Grad / JuniorMedium◆ Commonly asked
    #streaming#validation
    PracticeGeeksforGeeks↗Search↗
  • Implement a token-bucket rate limiter as a service.
    New Grad / JuniorMedium◆ Commonly asked
    #rate-limit
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • SQL vs NoSQL — how do you choose for a given workload?
    New Grad / JuniorMedium◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
  • Explain how a hash index differs from a B-tree index.
    New Grad / JuniorHard◆ Commonly asked
    #databases#indexing
    PracticeGeeksforGeeks↗Search↗
  • Trade-offs of gRPC vs REST vs GraphQL.
    New Grad / JuniorMedium◆ Commonly asked
    #api-design
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

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

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