Amazon Software Engineer Interview Questions
Amazon Software Engineer interview questions typically assess both algorithmic craftsmanship and fit with Amazon’s culture. What’s distinctive is the dual emphasis: expect intense coding and problem-solving rounds (data structures, algorithms, complexity and correct edge-case handling), a system-design evaluation for more senior roles, and behavioral deep-dives tied to Amazon’s Leadership Principles. The interview loop often includes an online assessment or phone screen, followed by a multi-interviewer loop that features a Bar Raiser whose role is to ensure high hiring standards. Clear communication, tradeoff reasoning, and testable, clean code are repeatedly evaluated. For interview preparation, focus on three threads: timed coding practice on medium-to-hard problems with careful explanation of complexity and edge cases; concise STAR-format behavioral stories that map directly to Leadership Principles and show impact; and system-design sketches for senior levels that justify choices around scalability, availability, and cost. Run mock interviews to practice speaking clearly, articulate tradeoffs, and rehearse writing and testing code under time pressure. Recruiters will guide scheduling, but sustained, focused practice gives the best chance to demonstrate both technical depth and cultural fit.

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Design streaming error-log counting with moving average
Design a core component in a streaming system: Input: - Multiple upstream services continuously emit log events. - Each event includes at least: servi...
Maximize weighted subsequence pairs with wildcards
You are given a string s of length n consisting only of characters '0', '1', and '!'. Each '!' can be replaced by either '0' or '1'. For the final bin...
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...
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 ...
Maximize protected population and bitwise AND
You are given two independent coding problems. Problem 1: Maximize protected population after moving units There are n cities in a line (indexed 1..n)...
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 ...
Answer two coding questions (SQL and DP)
Solve the following two coding tasks. Problem A (SQL) You are given a table: Employee(id INT, salary INT) Write a query that returns the second highes...
Design a replicated cloud storage service
Design the internals of a cloud storage service (object/blob storage). Focus on storage/infra concerns rather than end-user features. Cover the follow...
Design a cloud database write path and recovery
System Design (Engine-level): Write Path + Crash Recovery Design a core subsystem for a cloud-native relational database (Aurora-like) where compute i...
Merge two sorted arrays in-place
Given two arrays arr1 and arr2, both sorted in ascending order. - Modify arr1 in-place to contain all elements from arr1 and arr2 in ascending order. ...
Answer Amazon-style leadership deep dives
Behavioral / Leadership Prompt (Principal level) Prepare to answer deep-dive leadership questions with heavy follow-ups. Scenarios to cover - A failed...
Explain overfitting, regularization, and LLM techniques
You’re in an ML interview. Answer the following conceptual questions clearly and concisely, using examples where helpful: 1) Model fit - What is overf...
Maximize protected population with one-step guard shifts
There are n cities in a line (1-indexed). You are given: - population[1..n]: population of each city - unit: a binary string of length n, where unit[i...
Design a weighted random value generator
Weighted random value generator Design a generic component that stores values with integer weights and can return a random value with probability prop...
Find when failures started in log stream
You are given an array of log entries sorted by timestamp ascending. Each log entry contains: - timestamp (monotonic increasing) - status ∈ {OK, FAIL}...
Choose lock granularity for concurrent storage
You are implementing a component inside a storage engine that is accessed concurrently (e.g., an in-memory index, metadata cache, or block map). Discu...
Answer Dive Deep and Ownership in LP interview
Behavioral (Amazon LP): Dive Deep & Ownership The interviewer will probe your prior work and may connect follow-ups to the technical discussion. Promp...
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 array duplicates and two-type subarray
Coding questions Solve the following array problems. Problem 1: Check for duplicates Given an integer array nums, return true if any value appears at ...
Explain inheritance, polymorphism, constructors, destructors
OOP fundamentals Answer the following concept questions and provide a small example where requested: 1. Inheritance vs. polymorphism - Explain what...