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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

← American Express

Mid Full-stack at American Express

Full-stackMidWithdrew◆ Commonly asked· 2025

5-round mid fullstack process. Balanced across coding, design, and collaboration.

The loop · 5 rounds

01

Round 01 · 3 questions

DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

  • Trapping rain water.
    MidHard◆ Commonly asked
    #two-pointers#array
    PracticeLeetCode↗GeeksforGeeks↗
  • Kth smallest element in a BST.
    MidMedium◆ Commonly asked
    #tree#bst
    PracticeLeetCode↗GeeksforGeeks↗
  • Largest rectangle in histogram.
    MidHard◆ Commonly asked
    #stack#monotonic-stack
    PracticeLeetCode↗GeeksforGeeks↗
02

Round 02 · 2 questions

Machine Coding

Build a working component or service under time pressure.

  • Build a nested checkbox tree with indeterminate state.
    MidHard◆ Commonly asked
    #react#recursion
    PracticeGeeksforGeeks↗Search↗
  • Build a REST endpoint with pagination, filtering and sorting.
    MidMedium◆ Commonly asked
    #api#pagination
    PracticeGeeksforGeeks↗Search↗
03

Round 03 · 1 question

Low-Level Design

Object-oriented / low-level design of a focused module.

  • Design a toast/notification manager API.
    MidMedium◆ Commonly asked
    #oop#pub-sub
    PracticeGeeksforGeeks↗Search↗
04

Round 04 · 3 questions

Tech Deep-Dive

Deep questions on your core stack and fundamentals.

  • ACID vs BASE and transaction isolation levels.
    MidHard◆ Commonly asked
    #databases#transactions
    PracticeGeeksforGeeks↗Search↗
  • How do you retry without amplifying load?
    MidHard◆ Commonly asked
    #reliability
    PracticeGeeksforGeeks↗Search↗
  • Accessibility: how do you make a custom widget usable?
    MidMedium◆ Commonly asked
    #a11y
    PracticeGeeksforGeeks↗Search↗
05

Round 05 · 2 questions

Behavioral / HR

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

  • When did you have to make a decision with incomplete data?
    Mid◆ Commonly asked
    #judgment#star
  • Tell me about a time you had to say no to a stakeholder.
    Mid◆ Commonly asked
    #influence#star

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