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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Choose Effective Graphs for Data Exploration
Exploratory Data Visualization: Choosing the Right Charts Context You are performing exploratory data analysis (EDA) on a dataset with a mix of catego...
Select maximum tasks before deadlines
You are given a set of tasks, each with a positive duration and a deadline (lastDay). You may schedule tasks in any order but only one at a time. Find...
Demonstrate invent-and-simplify and customer communication
Behavioral: Two STAR Stories (Data Scientist, Technical Screen) Provide two concise STAR stories that demonstrate your ability to invent/simplify and ...
Generate primes up to n efficiently
Implement a function that returns all prime numbers in the inclusive range 1..n. Requirements: handle n up to 10^7 efficiently (time and memory); retu...
Compute p-values, CIs, and adjust multiples
Hypothesis testing and intervals in practice. Part A (z vs t): You sample n = 15 observations from a population with unknown variance and observe samp...
Implement streaming k-way merge with constraints
Implement a function merge_k(iterators, N) that returns the first N items of the global ascending order from k sorted, potentially unbounded iterators...
Evaluate concession gift-card policy with DID
Evaluate a Gift-Card Concession Pilot (Causal Impact with Staggered Adoption) Context Several regions piloted a policy: when a shipment is lost or dam...
Design fraud detection across channels with unknowns
Fraud Detection Strategy for a Multi‑Channel Marketplace Context: You are designing a fraud detection system for a large marketplace operating across ...
Implement list overlap and dense-ranked word frequencies
Part A — Multiset overlap count Implement count_overlap(a: List[int], b: List[int]) -> int that returns the size of the multiset intersection of a and...
Find max equal-frequency block count for each prefix
Given a string S of length n (e.g., uppercase letters), for every prefix P = S[0..i] (for i = 0..n-1), compute the maximum integer k such that: - The ...
Compute total revenue from greedy VM rentals
You manage n VM types. VM type i starts with inventory a[i] (number of available instances). There are m customers arriving one by one. For each custo...
Design logo infringement detection system
Scenario You work for a large e-commerce company. Brands register their official logos with you (e.g., Nike swoosh, Apple logo, etc.). Third-party sel...
Describe a time you solved a complex problem
Behavioral (Leadership/Ownership): Describe a time when you solved a complex problem by digging into details. In your answer, cover: - The context and...
Describe Your Professional Journey and Leadership Experiences
Behavioral & Leadership Interview Prompt (Data Scientist — Technical Phone Screen) Scenario You are interviewing for a Data Scientist role in an Amazo...
Mitigate Data Mistakes and Improve Team Efficiency
Behavioral Questions (STAR Format) Context: You are interviewing for a data role at Amazon, where leadership principles and measurable impact matter. ...
Identify Issues and Redesign Customer-Conversion Chart
Critique and Redesign a Customer-Conversion Visualization Context Assume you are reviewing a chart shown during an interview that attempts to explain ...
Discuss key behavioral experiences
Behavioral Interview (Onsite) — Software Engineer You are preparing for an onsite behavioral and leadership interview. Answer the following prompts us...
Demonstrate decision-making and collaboration behaviors
Behavioral & Leadership (Technical Screen) — CARL Format You are interviewing for a Software Engineer technical screen. Answer each prompt using the C...
Merge overlapping and adjacent ranges
Given an unsorted list of integer ranges represented as half-open intervals [start, end) with start < end, merge all overlapping or directly adjacent ...
Insert and merge an interval
You are given a list of pairwise non-overlapping closed intervals [si, ei] sorted by start time, and a new interval [s, e]. Insert [s, e] into the lis...