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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

← DoorDash

New Grad / Junior Backend at DoorDash

BackendNew Grad / JuniorOutcome unknown◆ Commonly asked· 2025

5-round junior backend process. Pragmatic questions — more real-world than pure puzzles.

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.

  • Min cost to connect all points.
    New Grad / JuniorMedium◆ Commonly asked
    #graph#mst
    PracticeLeetCode↗GeeksforGeeks↗
  • Minimum window substring.
    New Grad / JuniorHard◆ Commonly asked
    #sliding-window#string
    PracticeLeetCode↗GeeksforGeeks↗
  • Merge k sorted lists.
    New Grad / JuniorHard◆ Commonly asked
    #heap#linked-list
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a background job runner with priorities.
    New Grad / JuniorMedium◆ Commonly asked
    #queue#workers
    PracticeGeeksforGeeks↗Search↗
  • Implement a job queue with retries and backoff.
    New Grad / JuniorHard◆ Commonly asked
    #queue#reliability
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Trade-offs of gRPC vs REST vs GraphQL.
    New Grad / JuniorMedium◆ Commonly asked
    #api-design
    PracticeGeeksforGeeks↗Search↗
  • How do you prevent and detect N+1 queries?
    New Grad / JuniorMedium◆ Commonly asked
    #databases#orm
    PracticeGeeksforGeeks↗Search↗
  • Explain the difference between horizontal and vertical scaling.
    New Grad / JuniorEasy◆ Commonly asked
    #scale
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • A time you influenced a decision without authority.
    New Grad / Junior◆ Commonly asked
    #influence#star
  • How do you handle being blocked for several days?
    New Grad / Junior◆ Commonly asked
    #ownership#star

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