Amazon Coding & Algorithms Interview Questions
Practice 689 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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Implement a Single-Node Priority Pub/Sub
Implement a simplified in-memory publish-subscribe system that runs on a single machine. The system should support users subscribing to topics with a ...
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...
Design a URL shortening platform
Design a Scalable URL Shortening Platform Context Build a Bitly-like URL shortener that maps long URLs to short codes and performs HTTP redirection re...
Design an Offline Multi-Device E-Book Reader
Design an Offline Multi-Device E-Book Reader Design an e-book reader service with APIs, database schema, and overall architecture. A user may read off...
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...
Design a Ride-Hailing Matching System
Design a ride-hailing matching system similar to a taxi or rideshare application (e.g. Uber, Lyft, DiDi). The interview focuses on the driver-location...
Compute an A/B test p-value by hand
In an A/B test on a game feature, you measure conversion rate (binary outcome). - Control: n₁ = 1000 users, x₁ = 120 conversions - Treatment: n₂ = 980...
Write SQL window functions for D7 retention
Assume you have the following tables (timestamps are in UTC). 1) game_sessions - user_id (STRING) - session_start_ts (TIMESTAMP) - country (STRING) Ea...
Solve Nearby Inventory and Word Segmentation Tasks
Two Algorithmic Tasks Implement both parts. They are independent and should have separate functions. Part A - Nearby Centers with Inventory An undirec...
Design a pizza ordering system
Design the core object-oriented model for a pizza ordering system used by a small restaurant. The system should allow customers to: - browse a menu of...
Answer Amazon Leadership Principle Scenarios
In an Amazon Data Scientist intern virtual interview, answer behavioral questions using the STAR method and tie each story to Amazon Leadership Princi...
Design delayed job scheduler (LLD)
Design a Delayed Job Scheduler (Low-Level Design) Design a service that schedules a job to execute X seconds in the future with second-level accuracy....
Describe a challenging project
You are interviewing for an L5 Data Scientist role. Answer the following behavioral questions in a way that demonstrates Deliver Results: 1. Tell me a...
Design a Multi-Provider Financial Dashboard
Design a financial dashboard that shows account balances, stock holdings, cryptocurrency holdings, and derived portfolio metrics. Data arrives from mu...
Design a High-Availability Load Balancer
This question evaluates knowledge of distributed systems and load balancing principles, covering high-availability architecture for HTTP/HTTPS traffic...
Minimum Path Length Through a Grid With One Allowed Cell Conversion
You are given an m x n grid grid where every cell holds either 1 (an open cell you may stand on) or 0 (a blocked cell). You start at the top-left cell...
Implement Review Content Moderation
This question evaluates a candidate's ability to implement consistent server-side content moderation and stateful persistence handling in a backend se...
Describe handling deadlines, pride, and conflict
Behavioral questions Answer the following interview prompts with concrete examples from your past work/school/internships: 1. Tight deadline: Tell me ...
Design a computer-use agent end-to-end
This question evaluates competency in designing end-to-end multimodal interactive ML systems, including perception from pixels and accessibility trees...
Design multi-tenant ingestion and processing platform
This question evaluates a candidate's ability to architect scalable, multi-tenant data ingestion and processing platforms, assessing competencies in t...