Amazon Coding & Algorithms Interview Questions
Practice 695 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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Find LCA in a BST
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Manipulate time-series with Pandas groupby
Given a DataFrame events(user_id, event_type, ts_utc, revenue): 1) Parse ts_utc as timezone-aware, convert to America/Los_Angeles, and handle DST tran...
Design a hierarchical locking tree
Design a hierarchical locking tree Design a LockingHierarchy data structure over a rooted tree of N nodes labeled 0..N-1, initialized with an integer ...
Find odd-frequency element with O(1) space
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Count expressions reaching a target sum
Count expressions reaching a target sum Given an array of non-negative integers nums and an integer target T, assign either a + or − sign to each numb...
Compute optimal locker placement with obstacles
Compute optimal locker placement with obstacles Given house coordinates H = {(xi, yi)} and tree coordinates T = {(xj, yj)} on a 2D integer grid, choos...
Design a streaming median structure
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...
Implement two array-cost minimization algorithms
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Determine reachability and optimize task scheduling
Question LeetCode 780. Reaching Points: Given four integers a, b, c, d (1 <= a, b, c, d <= 1000). Starting from (a, b) you may repeatedly apply either...
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...
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...
Design Efficient Data Structure for Median Retrieval
Scenario Senior problem-solving round assessing algorithmic thinking under time pressure. Question Design a data structure that supports inserting int...
Determine Discount's Effect on Conversion Rate with A/B Testing
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