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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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 ...
Implement DFS and tree algorithms
Part 1 (DFS on graph): Given an undirected graph with n nodes labeled 0..n-1 and an edge list, implement a function that returns all connected compone...
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...
Design a basic task management system
Design a Simple Task Management Service Requirements Design a simple task management system that supports: 1. Add a new task with a unique ID and desc...
Discuss deadlines, feedback, and deep dives
Question This Amazon software engineer behavioral screen walks through a set of leadership-principle prompts. Be ready to tell a distinct, recent stor...
Solve string partition and equal-sum package problems
1) Given a string itemCategories (lowercase English letters) and an integer k (0 ≤ k ≤ 26), count the number of indices i (1 ≤ i < n) that partition t...
Debug distributed-system performance problems
You are asked: “If a distributed system has a performance problem (latency/throughput regression), how would you approach it?” Describe a practical, s...
Explain LLM fundamentals and trade-offs
LLM Fundamentals — Onsite Interview Task Context: Assume a modern transformer-based LLM. Provide precise, concise explanations with examples and trade...
Explain deadlines, going beyond, and persuasion
Behavioral Prompt: Delivery Under Pressure, Exceeding Expectations, and Influencing Stakeholders Context: You are interviewing for a Software Engineer...
Explain attention and Transformers
Scaled Dot-Product Self-Attention, Transformer Architecture, and BERT vs GPT You are interviewing for a software engineer role focused on machine lear...
Merge overlapping intervals
Given a list of half-open numeric intervals [start, end), merge all overlapping or contiguous intervals and return a list of non-overlapping intervals...
Explain ML evaluation, sequence models, and optimizers
Scenario An interviewer is deep-diving into an ML project you built (you can assume it is a supervised model unless specified otherwise). They want yo...
Find shortest subarray to restore order
Given an integer array, find the shortest contiguous segment which, if sorted in ascending order, makes the entire array non-decreasing. Return the le...
Describe handling deadlines, conflicts, feedback, and ownership
Behavioral Interview Prompts — Software Engineer (Onsite) Context: You will be asked to share specific, first-person examples using a structured forma...
Maximize points with limited coworker skips
You and a coworker must unload a sequence of warehouses. For warehouse i there are c[i] items (non‑negative integers). Turns alternate starting with y...
Amazon New-Service Launch Cases
Product Design Case: Launch Three Products at Amazon You are asked to outline how you would approach launching three distinct products at Amazon: 1. A...
Amazon Behavioral Deep-Dive
Question Prepare concise STAR (Situation, Task, Action, Result) stories for the Amazon Product Manager behavioral round. The interviewer may probe any...
Implement PyTorch training loop
Implement a basic PyTorch training loop You are given a PyTorch neural network model, a DataLoader that yields (inputs, targets) batches, an optimizer...
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 number to form an expression. Count how many...
Explain Transformers and MoE in LLMs
You are interviewing for a role working with large language models (LLMs). Explain the following concepts and how they relate to building and scaling ...