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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

← Sierra

New Grad / Junior Full-stack at Sierra

Full-stackNew Grad / JuniorOutcome unknown◆ Commonly asked· 2025

5-round junior fullstack 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.

  • Find the missing number in 1..n.
    New Grad / JuniorEasy◆ Commonly asked
    #math
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Diameter of a binary tree.
    New Grad / JuniorEasy◆ Commonly asked
    #tree#dfs
    PracticeLeetCode↗GeeksforGeeks↗
  • Decode ways.
    New Grad / JuniorMedium◆ Commonly asked
    #dp#string
    PracticeLeetCode↗GeeksforGeeks↗
  • Pow(x, n).
    New Grad / JuniorMedium◆ Commonly asked
    #math#recursion
    PracticeLeetCode↗GeeksforGeeks↗
03

Round 03 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build auth middleware that verifies a JWT.
    New Grad / JuniorMedium◆ Commonly asked
    #auth#security
    PracticeGeeksforGeeks↗Search↗
  • Build a nested checkbox tree with indeterminate state.
    New Grad / JuniorHard◆ Commonly asked
    #react#recursion
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • Explain CORS and how a preflight request works.
    New Grad / JuniorMedium◆ Commonly asked
    #browser#security
    PracticeGeeksforGeeks↗Search↗
  • Explain how Promises work and implement Promise.all.
    New Grad / JuniorMedium◆ Commonly asked
    #javascript#async
    PracticeGeeksforGeeks↗Search↗
  • Message queues vs pub/sub — when to use each.
    New Grad / JuniorMedium◆ Commonly asked
    #messaging
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • How do you handle competing priorities from two managers?
    New Grad / Junior◆ Commonly asked
    #prioritization#star
  • A time you influenced a decision without authority.
    New Grad / Junior◆ Commonly asked
    #influence#star

Practice each round across every company

  • Online Assessment
  • DSA / Coding
  • Machine Coding
  • Tech Deep-Dive
  • Behavioral / HR

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