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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

← Nubank

New Grad / Junior Backend at Nubank

BackendNew Grad / JuniorOutcome unknown◆ Commonly asked· 2023

5-round junior backend process. 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.

  • Simulate a simple inventory system from a spec.
    New Grad / JuniorMedium◆ Commonly asked
    #simulation
    PracticeGeeksforGeeks↗Search↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Container with most water.
    New Grad / JuniorMedium◆ Commonly asked
    #two-pointers#array
    PracticeLeetCode↗GeeksforGeeks↗
  • Contains duplicate.
    New Grad / JuniorEasy◆ Commonly asked
    #array#hashmap
    PracticeLeetCode↗GeeksforGeeks↗
  • Combination sum.
    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 a URL health checker with a concurrency limit.
    New Grad / JuniorMedium◆ Commonly asked
    #concurrency
    PracticeGeeksforGeeks↗Search↗
  • Build a CSV importer that streams and validates rows.
    New Grad / JuniorMedium◆ Commonly asked
    #streaming#validation
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • What is backpressure and how do you handle it?
    New Grad / JuniorHard◆ Commonly asked
    #streaming#reliability
    PracticeGeeksforGeeks↗Search↗
  • Explain optimistic vs pessimistic locking.
    New Grad / JuniorHard◆ Commonly asked
    #databases
    PracticeGeeksforGeeks↗Search↗
  • ACID vs BASE and transaction isolation levels.
    New Grad / JuniorHard◆ Commonly asked
    #databases#transactions
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • Tell me about a time you simplified something overly complex.
    New Grad / Junior◆ Commonly asked
    #judgment#star
  • Tell me about the hardest bug you have debugged.
    New Grad / Junior◆ Commonly asked
    #debugging#star

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