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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Resolve Conflict and Challenge Project Decisions
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Design streaming error-log counting with moving average
Design a core component in a streaming system: Input: - Multiple upstream services continuously emit log events. - Each event includes at least: servi...
Compute the Median After Each Stream Insertion
Compute the median after every insertion into an integer stream without repeatedly sorting the full prefix. Practice maintaining balanced data structu...
Predicting the Next Elevator Call Location
This machine learning question tests the ability to design a predictive model for spatio-temporal demand forecasting, covering problem framing, featur...
Find the Minimum Processing Rate to Meet a Deadline
Find the smallest integer processing rate that completes independent workloads before a deadline when unused hourly capacity cannot be shared. The pro...
Fix the Password Reset Workflow
This question evaluates debugging and software engineering fundamentals around authentication flows, including verification code generation and expiry...
Answer Amazon-style behavioral questions
You are interviewing for a role at Amazon and are asked the following behavioral questions. Answer each using the STAR method (Situation, Task, Action...
Clarify and Solve a Rotate-or-Flip Array Puzzle
Clarify and Solve a Rotate-or-Flip Array Puzzle An interviewer gives you an array of distinct integers and asks for the minimum number of rotate or fl...
Choose Work-Style Assessment Responses
This question evaluates work-style and behavioral competencies such as initiative, adaptability, dependability, attention to detail, and internal cons...
Design a Core Dump Collection and Analysis System
Prepare for a Amazon system design interview about design a core dump collection and analysis system. This question focuses on requirements, architect...
Design an S3-like object storage service
Design a cloud object storage service similar to Amazon S3. The service should allow clients to upload, store, and download large files reliably and e...
Design a Scalable and Polite Web Crawler
Design a horizontally scalable web crawler with a durable frontier, host-level politeness, deduplication, parsing, and recrawl planning. Examine URL n...
Evaluate NLP Classification Models
You are interviewing for a Data Scientist internship at Amazon. The interviewer asks you to walk through how you think about an NLP classification pro...
Answer Amazon Behavioral Questions
Question You are in the behavioral portion of an Amazon final-round interview (Software Development Engineer internship). Prepare strong, structured r...
Implement a Half-Open Interval Range Module
Implement a Half-Open Interval Range Module Implement a module that tracks subsets of the real-number line using half-open intervals [left, right). Pr...
Monthly Cohort Retention
This question evaluates practical SQL skills in user retention analysis, specifically the ability to build a monthly cohort retention table from raw a...
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 ...
Answer Leadership and GenAI Behavioral Questions
Prepare structured behavioral interview answers for the following prompts. Use specific real experiences, quantify impact when possible, and be ready ...
Prepare Leadership Principle Stories
This question evaluates leadership, ownership, decision-making, communication, and problem-solving competencies through concrete first-person project ...
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...