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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Solve three coding tasks: binary search, tree path, subarray
Solve the following coding tasks: 1) In a sorted array, every value appears exactly twice except for one value that appears once. Find the single valu...
Implement a formatted shell script output
Write a shell script named script.sh that is invoked as: ./script.sh <username> <path_of_file>. It must print a single line formatted exactly as: <tim...
Describe impact, ambiguity, and conflict
You are speaking with an Amazon hiring manager for a non-technical role. Answer the following behavioral questions using the STAR format: 1. Briefly i...
Design a streaming median structure
Design a data structure for a number stream that supports: add(num: int) in O(log n) time and median() -> float in O( 1) or O(log n) time. It must han...
Compute optimal locker placement with obstacles
Given house coordinates H = {(xi, yi)} and tree coordinates T = {(xj, yj)} on a 2D integer grid, choose a locker location L = (x, y) such that L ∉ T a...
Reflect on self, goals, learning, competitions
You are asked several behavioral questions in an interview: 1. Self-description: Give three words that accurately describe you as a professional (e.g....
Find concatenated words in list
Question LeetCode 472. Concatenated Words – Given an array of strings words, return all words that are concatenations of at least two shorter words al...
Compute delay times in priority array
Question Given an array of integers representing task priorities processed from right to left, return an array where each element is the distance (ind...
Compute minimum delivery days
Question Given N distribution centers numbered 1..N and an orderCityList of length M where orderCityList[i] denotes the city that the i-th order must ...
Demonstrate Amazon leadership principles
Behavioral & Leadership Interview (Software Engineer — Onsite) Provide STAR-structured answers (Situation, Task, Action, Result). Use one concrete sto...
Facilitate Effective Collaboration in Tech Data-Science Teams
Behavioral & Leadership (Data Scientist Onsite) Scenario You are interviewing for a Data Scientist role focused on cross-functional collaboration and ...
Design A/B Test for New Amazon Recommendation Module
A/B Test Design: Home Page Recommendation Module Scenario Amazon plans to introduce a new product recommendation module on the home page and wants to ...
Explain Overfitting and Underfitting in Machine Learning
ML Fundamentals and Computer Vision: Core Concepts Instructions You are interviewing for a data science role focused on classical ML and computer visi...
Evaluate RAG System Accuracy and Cost Control Strategies
Technical Phone Screen: LLM Pipelines, Knowledge Graphs, and RAG Context You are designing and operating LLM-based applications that integrate a knowl...
Solve Search Insert Position Using Binary Search
Scenario Live coding round for an Amazon Applied Scientist position; candidate must solve LeetCode 35 (Search Insert Position) without helper librarie...
Deliver a Data Solution Under Tight Deadlines
Behavioral Prompt: Delivering Under a Tight Timeline Scenario A critical product launch date was moved up by two weeks, and your team is already at ca...
Evaluate Ensemble Models for Bias-Variance, Speed, and Interpretability
Large-Scale Recommendation System: Ensembles, Overfitting, Metrics, Architectures, and Optimization Context You are designing a large-scale recommenda...
Solve LeetCode string and list problems
Question LeetCode 767. Reorganize String LeetCode 23. Merge k Sorted Lists LeetCode 138. Copy List with Random Pointer https://leetcode.com/problems/r...
Discuss deadline, challenge, feature
Behavioral Questions for a Software Engineer Phone Screen These prompts assess your ownership, delivery under pressure, problem-solving, and end-to-en...
Choose lock granularity for concurrent storage
You are implementing a component inside a storage engine that is accessed concurrently (e.g., an in-memory index, metadata cache, or block map). Discu...