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.

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Implement Batch Gradient Descent for Linear Regression
Batch Gradient Descent for Linear Regression (MSE) Scenario You are building a linear regression model from scratch and will optimize its parameters u...
Implement Interview Coding Problems
Solve the following independent coding tasks from a new-grad software engineering interview. 1. Implement a hash map from scratch. - Support integer k...
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 ...
Find Affected Services After Shutdown
You are given a set of services and their dependency relationships. The input is a hash map where each key is a service name, and the value is a list ...
Diagnose Bias–Variance Trade-off in Supervised Learning
Supervised Learning Review (Customer-Facing Ranking Context) You are designing and evaluating models for a customer-facing ranking service (e.g., orde...
Approach an ambiguous business problem
In a science-application interview, you are given a business problem that is intentionally vague. The interviewer wants to see how you handle ambiguit...
Answer Leadership and Collaboration Prompts
Prepare strong answers for the following behavioral prompts. Interviewers will likely ask follow-up questions about the customer impact, problem, acti...
Serialize and deserialize a binary tree
Problem Design two functions to serialize and deserialize a binary tree. - Serialize: convert a binary tree into a single string. - Deserialize: recon...
Solve two-sum variants at scale
Base task: Given nums = [3, 1, 2, 2, 4] and target = 4, return the 0-based index pair (i, j) with i < j such that nums[i] + nums[j] = target. If multi...
Diagnose and fix underperforming ML model
Rapidly Improving Recall Under Class Imbalance (One-Day Plan) Context You inherit a binary fraud detection model with severe class imbalance (positive...
Design and analyze pricing-page A/B test
AB Test Plan: New Pricing-Page Layout Context: You will run a 2-arm online experiment on a pricing page. The primary metric is user-level paid convers...
Find top-spend categories per customer with ranking
Using the schema and sample data below, write a single ANSI SQL query (CTEs allowed; no temp tables) that returns, for each customer, their top 2 prod...
Root-cause an incident and drive consensus
Root-Cause Plan: Sudden Drop in Voice Checkout Conversion (Alexa Shopping) You are informed that the "voice checkout conversion" KPI for Alexa Shoppin...
Estimate live sports impact on subscriptions
Estimate the Causal Impact of Live Sports on Prime Subscriptions and Engagement Context Amazon is considering adding live broadcasts of selected sport...
Build DID panel and compute effects in SQL
Using the schema and toy data below, write SQL to construct a user-week panel and compute a clean pre/post DID dataset for first reminder exposure. Re...
Explain core ML concepts and diagnostics
You are in an ML breadth interview for a Senior Applied Scientist role. Answer the following conceptual questions clearly and practically (definitions...
Describe challenges, mistakes, timeline management, communication
Behavioral & Leadership – Software Engineer Technical Screen Context: You are preparing for a software engineer technical screen that emphasizes behav...
Compute product excluding index without division
Given an integer array nums, return an array ans where ans[i] equals the product of all elements of nums except nums[i], without using division. Achie...
Compute shortest path with obstacles
You are given an m×n grid with nonnegative cell costs and blocked cells marked '#'. You may move up, down, left, or right. Given start (sx, sy) and ta...
Find LCA in a BST
Given the root of a binary search tree and two keys p and q, return the value of their lowest common ancestor (the deepest node whose value lies betwe...