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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Object-Oriented Design: Snake Game
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GRPO Deep Dive: Critic-Free RL, Parallelism, MLA, and Reward Design for a Reasoning LLM
This question assesses understanding of reinforcement learning algorithms used to post-train large reasoning language models, including critic-free po...
Find the Single Value in a Sorted Array of Pairs
Find the Single Value in a Sorted Array of Pairs Problem Implement singleNonDuplicate(values) -> value. values is sorted in nondecreasing order. Exact...
Design a Library Management System (API and Schema)
This question tests practical system design skills by requiring candidates to model a relational data schema and REST API for a library lending system...
High Availability and Failover for a Primary-Replica Database
This question evaluates a candidate's understanding of database high-availability design, including replication semantics, failure detection, and fail...
LLM Fundamentals: Tokenization Design and KL-Regularized SFT
This question evaluates depth of knowledge in large language model fundamentals, specifically subword tokenization design and KL-regularized supervise...
Answer Behavioral Questions About Deadlines, Feedback, and Ambiguity
Prepare behavioral answers about tight deadlines, critical feedback, ambiguous requirements, and AI-related work experience. `hint Hint 1 Start by sta...
Design an In-Memory Pub-Sub Model
Design an object-oriented, in-memory publish-subscribe model. Requirements: - A publisher can publish a message to a topic. - A subscriber can subscri...
Design a Perishable-Goods Inventory and Location Tracking System
This system design question evaluates the ability to architect a location-tracking and inventory service for perishable goods across a distributed ret...
Design Human Avoidance for Warehouse Robots
This question evaluates sensor fusion, perception-to-motion data flow, short-horizon motion planning, and real-time safety-critical decision-making fo...
Navigate a Tight Deadline and an Ambiguous Engineering Project
Navigate a Tight Deadline and an Ambiguous Engineering Project Prepare two examples from your engineering experience: one in which you worked under a ...
Design Music Search, Playlists, and Playback Controls
Design the domain model and service interfaces for music search, ordered playlists, and playback controls. The discussion covers canonical catalog dat...
Rate Engineering Work Simulation Responses
This question evaluates situational judgment and behavioral leadership competencies in a software engineering context, focusing on ownership, communic...
Behavioral: Learn and Be Curious
This behavioral question evaluates a software engineer's capacity for self-directed learning and intellectual curiosity under real project constraints...
Compute Edit Distance
Compute Edit Distance Given two strings, return the minimum number of single-character operations needed to transform the first string into the second...
Design a Log Collection System
This question evaluates a candidate's ability to design a scalable, fault-tolerant log collection and search pipeline, covering distributed ingestion ...
Validate AI-Generated Code Safely
This question evaluates experience with generative AI tools and the competency in validating AI-generated code for correctness, maintainability, and s...
Describe Deadline, Mistake, Problem-Solving, and AI Experiences
You are interviewing for a Software Engineer (Intern) role at Amazon, in an on-site loop of two back-to-back 60-minute rounds. Each round mixes a beha...
Design an advertiser metrics tracking platform
This question evaluates object-oriented design competencies such as domain modeling, class responsibilities and relationships, service interfaces, ext...
Explain Transformer and MoE Fundamentals
This question evaluates a candidate's conceptual mastery of modern deep-learning internals for large-language models, including distinctions between t...