Amazon Coding & Algorithms Interview Questions
Practice 600 real Amazon interview questions for 2026. Covers all top categories — Coding & Algorithms, Behavioral & Leadership, Machine Learning, Data Manipulation (SQL/Python), and System Design — across Software Engineer, Data Scientist, Machine Learning Engineer, Product Manager, and Business Intelligence Engineer roles. Real Amazon interview questions from actual interviews with detailed solutions; use this collection for interview preparation that emphasizes shipping at scale, measurable impact, and the company’s Leadership Principles. Expect coding-heavy assessments for Software Engineer candidates: frequent tree and dynamic-programming problems, two-array optimization patterns, nested object/path lookups, and system-design prompts that mirror product flows (online Minesweeper, pizza-ordering, credit-card and shipping/cost systems), plus leadership and collaboration behavioral prompts. Data Scientist rounds concentrate on experimentation and metrics (A/B design, hand p-values, D7 retention SQL), RAG/recommender evaluation, and product-impact analyses. ML Engineer questions focus on production model design, LLM/agent concepts, reliability (cold start, training stability, online vs offline gaps), and large-scale detection pipelines. PM interviews stress customer-obsessed stories, ambiguity, Alexa product launches, and domain-specific data pipelines. Prepare with timed coding practice, end-to-end experiment writeups, STAR stories framed to Leadership Principles, and mock system-design sessions.
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Explain NLP/RL concepts used in LLM agents
You are interviewing for an applied ML role focused on LLM agents and retrieval-augmented generation (RAG). Answer the following conceptual questions ...
Solve Two Array Optimization Problems
This online assessment included two coding problems. Problem 1: Maximize protected city population You are given: - an integer n - an array population...
Answer two coding questions (SQL and DP)
Solve the following two coding tasks. Problem A (SQL) You are given a table: Employee(id INT, salary INT) Write a query that returns the second highes...
Return all valid word-break sentences
Given a string s and a dictionary of strings wordDict, insert spaces into s to form a sentence such that every token is in wordDict. Return all possib...
Describe complex projects, failures, and pivots
In a software engineering internship interview, you may be asked a set of behavioral questions about project complexity, decision-making, failure, and...
Predicting the Next Elevator Call Location
Predicting the Next Elevator Call Location You are a data scientist for a building-operations company. To cut resident wait times, the operations team...
Count Connected Components in an Undirected Graph
You are given n nodes labeled from 0 to n - 1 and a list of undirected edges. Each edge is represented as a pair [u, v], meaning there is an undirecte...
Design a replicated cloud storage service
Design the internals of a cloud storage service (object/blob storage). Focus on storage/infra concerns rather than end-user features. Cover the follow...
Implement a Worker Hours Register
Implement an in-memory WorkHoursRegister system for contract workers. The system tracks office entry and exit events, completed work time, promotions,...
Implement decoder-only GPT-style transformer
Goal Implement a simplified decoder-only Transformer language model (similar in spirit to GPT) for next-token prediction. The implementation should be...
Describe past NLP work and collaboration
Scenario In an initial phone screen, the interviewer asks you to introduce yourself, then drills into your resume. Questions (answer using concrete ex...
Design and evaluate a RAG system
You are interviewing for an L5 Data Scientist role focused on LLM applications. Design a retrieval-augmented generation (RAG) system for an internal q...
Find recommended friend pairs by shared listening
Problem (SQL) You work on a music app and want to recommend new friend connections based on listening similarity. Tables Assume the following schemas:...
Solve tree and DP problems
This coding round contained two algorithm questions: 1. Deepest shared ancestor in a binary tree You are given the root of a binary tree and two ...
Explain conflict, ownership, and AI use
Question Prepare structured answers for an Amazon-style behavioral interview (intern / early-career software engineer) that probes leadership-principl...
Find Unique Target-Sum Pairs
Given an integer array nums and an integer target, return all unique pairs of values whose sum equals target. Requirements: - Each returned pair shoul...
Solve two string problems
You are asked to solve the following two coding problems. 1. Count unique Morse code translations You are given an array of lowercase English w...
Print all odd numbers from an integer list
Problem Given a list/array of integers nums, print (or return) every odd number in the list, in the same order they appear. Clarifications / follow-up...
Build a Searchable Sentence Index
Design and implement an in-memory data structure for a collection of sentences. Each sentence has a unique integer id and a text body. Support the fol...
The Most Comprehensive Amazon PM Questions
Behavioral & Leadership Interview (Product Manager — Onsite) Context: These prompts align with Amazon's Leadership Principles and are commonly used in...