Amazon Coding & Algorithms Interview Questions

Amazon Coding & Algorithms interview questions focus heavily on data structures, algorithmic problem solving, and clear on-the-spot implementation. What’s distinctive is the combination of speed and depth: interviewers evaluate correctness, time and space complexity, edge-case handling, and the candidate’s ability to communicate a stepwise approach under time pressure. Expect array/string manipulation, trees/graphs, hashing, dynamic programming, and occasional system- or design-lite prompts for senior roles, with behavioral ties to Amazon’s leadership principles sometimes woven into technical rounds. Typical loops begin with one or two timed phone screens followed by an onsite or virtual loop of multiple interviews that mix pure coding, design (for higher levels), and behavioral assessment; a bar-raiser may appear to ensure hiring standards. For effective interview preparation, practice timed coding problems across core topics, run mock interviews that force you to verbalize decisions, write clean, testable code, and rehearse concise STAR-style stories that highlight ownership and impact. Developing pattern recognition for problem types and routinely reviewing complexity and edge cases will make your responses faster, safer, and more persuasive.

233 Questions 1 Company08.11.2026
Showing 13 results
Role
Amazon logo
Amazon
Medium
Software Engineer

Implement basic calculator

Question LeetCode 227. Basic Calculator II – implement an arithmetic expression evaluator supporting +, -, *, / and integer operands https://leetcode....

Coding & Algorithms
10
0
32 people solved
Jul 29, 2025
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Amazon
Medium
Software Engineer

Determine Rounds for Star Substring Threshold

Question Given a string S, an offset array O (replacement order), and an integer M, repeatedly replace S[O[i]] with ''. Determine the minimum number o...

Coding & Algorithms
11
0
31 people solved
Jul 29, 2025
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Amazon
Medium
Software Engineer

Find largest island area

Question Given a 2D grid of 0s and 1s, find the largest area of a connected group of 1s (island) using 4-directional adjacency; return that area. (Var...

Coding & Algorithms
14
0
21 people solved
Jul 29, 2025
Amazon logo
Amazon
Medium
Software Engineer

Solve array and list algorithms

Question LeetCode 315. Count of Smaller Numbers After Self LeetCode 23. Merge k Sorted Lists Design algorithm for Amazon Locker getPackage (retrieve p...

Coding & Algorithms
5
0
14 people solved
Jul 29, 2025
Amazon logo
Amazon
Medium
Software Engineer

Compute minimum passes to collect numbers

Question You are given an array shelf of n distinct integers that is a permutation of 1…n. Starting with target = 1, you repeatedly scan shelf from le...

Coding & Algorithms
76
0
200 people solved
Jul 29, 2025
Amazon logo
Amazon
Medium
Software Engineer

Compute maximum distinct-product pickup days

Question Given an array of positive integers representing quantities of different products, on day i (starting from 1) you must pick exactly i distinc...

Coding & Algorithms
21
0
56 people solved
Jul 29, 2025
Amazon logo
Amazon
Medium
Software Engineer

Find most frequent log user

Question You are given a list of log entries in string format, where each entry contains a username and an access timestamp separated by a delimiter (...

Coding & Algorithms
24
0
49 people solved
Jul 29, 2025
Amazon logo
Amazon
Medium
Software Engineer

Solve frequency sort and all-pairs sum

Solve frequency sort and all-pairs sum Task 1 — Frequency-based string reorder: Given a string s containing ASCII characters, return a new string whos...

Coding & Algorithms
3
1
33 people solved
Jul 27, 2025
Amazon logo
Amazon
Medium
Software Engineer

Solve median extremes and segment flips

Solve median extremes and segment flips Part A — Sliding-window median extremes: - Input: an integer k (1 ≤ k ≤ n) and an array nums of length n. - Fo...

Coding & Algorithms
2
0
25 people solved
Jul 26, 2025
Amazon logo
Amazon
Medium
Software Engineer

Design 2D DP on a DAG

Design 2D DP on a DAG Given a directed acyclic graph G(V, E) with N nodes, M edges, a designated source s, and an integer L, design a 2D dynamic progr...

Coding & Algorithms
6
0
54 people solved
Jul 15, 2025
Amazon logo
Amazon
Medium
Software Engineer

Merge overlapping intervals

Merge overlapping intervals Given a list of half-open numeric intervals [start, end), merge all overlapping or contiguous intervals and return a list ...

Coding & Algorithms
2
1
44 people solved
Jul 15, 2025
Amazon logo
Amazon
Medium
Data Scientist

Implement Function to Determine Mode and Prime Numbers

Scenario Implementing utility algorithms within a data-processing library. Question Write a function that returns the mode of an integer list; if all ...

Coding & Algorithms
19
0
56 people solved
Jul 12, 2025
Amazon logo
Amazon
Medium
Data Scientist

Calculate 7-Day Rolling Average for Energy Consumption

Scenario Hiring manager wants a quick coding exercise to verify programming fluency. Question Write a Python function that takes a list of daily energ...

Coding & Algorithms
39
0
87 people solved
Jul 12, 2025

Frequently Asked Questions

How difficult are Amazon Coding & Algorithms interview questions?
Amazon Coding & Algorithms interview questions typically range from medium to hard. Early screens and online assessments tend to include medium problems that test correctness, edge-case handling, and basic optimization, while onsite coding rounds push toward harder algorithmic challenges that require solid data-structure intuition, efficient designs, and careful complexity analysis. Interviewers evaluate how you reason through tradeoffs, communicate your approach, and iterate under time pressure. Preparing realistic timed practice, learning to explain constraints and invariants clearly, and polishing test-case coverage will help you reliably perform at the company’s expected difficulty level.
What does the Amazon interview process look like and where do Coding & Algorithms questions appear?
Coding and algorithmic problems appear throughout Amazon’s technical hiring funnel: they commonly start in the online assessment or phone screen and continue as core rounds during the onsite or virtual loop. Early stages focus on single-problem implementation and correctness, while later technical interviews assess algorithmic depth, optimizations, and robustness under follow-up prompts. Parallel rounds may cover system design or behavioral evaluations, but coding rounds are central for software-engineering roles and often factor heavily in hiring decisions. Expect interviews to probe both your code and your problem-solving rationale, with interviewers asking for clarifications, complexity analysis, and test cases.
How should I structure a preparation timeline for Amazon Coding & Algorithms interviews?
Plan a structured timeline that balances fundamentals, applied practice, and mock interviews. Over eight to twelve weeks you can build a strong foundation by reviewing core data structures and algorithm patterns, then transition into daily timed problem solving and focused practice on weak areas. Regularly simulate interview conditions with timed questions and live mock interviews to practice explanation and pacing. Reserve time near the end for targeted review of past mistakes, readability and testing habits, and a couple of full-loop mock interviews. Shorter intensive timelines can work, but consistency and deliberate feedback cycles accelerate readiness most effectively.
What key subtopics should I master for Coding & Algorithms interviews at Amazon?
Prioritize mastery of arrays and strings, trees and graphs (BFS/DFS, topological order), dynamic programming patterns, hashing and two-pointer techniques, heaps and priority queues, and common greedy and binary-search approaches. Understanding complexity analysis, tradeoffs between time and space, and practical implementation details like handling nulls, overflow, and edge cases is essential. Equally important are writing clean, modular code and communicating thought processes clearly while iterating from brute-force to optimized solutions. Practicing pattern recognition and learning to adapt known templates to novel problem constraints will cover most frequent question types.
What practical tips will help me stand out, and what common pitfalls should I avoid during Amazon Coding & Algorithms interviews?
Stand out by clarifying requirements up front, proposing a brute-force idea first, and then iterating toward optimizations while explaining complexity tradeoffs. Verbally walk through representative test cases, handle edge cases explicitly, and keep code readable with clear variable names and small helper functions. Manage time by setting mini-milestones: plan, code, test, and optimize. Common pitfalls include diving into code without a plan, neglecting to test edge cases, ignoring interviewer hints, and getting stuck on micro-optimizations early. Unless an interviewer permits it, avoid using external assistants during live interviews and focus on demonstrating your independent problem-solving skills.

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