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.

"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."

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"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."
Determine if all courses can be completed
This question evaluates graph-theoretic dependency modeling and cycle-detection competency, measuring the ability to represent course prerequisites as...
Implement Event Filtering and Queue Routing
This question evaluates parsing and evaluation of domain-specific filter expressions, JSON traversal and type-aware comparisons, boolean logic handlin...
Minimize Circular Redistribution Cost
This question evaluates algorithmic problem-solving skills in array manipulation, circular data structures, load balancing, and cost optimization whil...
Find the Most Common Visit Pattern
This question evaluates the ability to process timestamped event logs and extract ordered length-3 visit sequences, testing skills in sorting, frequen...
Merge Multiple Sorted Arrays
This question evaluates a candidate's competency in array manipulation, merging techniques, and algorithmic complexity analysis, including handling ed...
Find a Valid Course Order
This question evaluates graph algorithm skills—specifically topological ordering, directed cycle detection, and analysis of time and space complexity....
Build a Searchable Sentence Index
This question evaluates a candidate's ability to design and implement in-memory text indexes and related data structures, covering inverted indexing, ...
Implement Cache and Rotate Matrix
Solve the following two independent coding tasks. Task 1: Implement an LRU Cache Design a data structure LRUCache that stores integer keys and integer...
Find Longest Activatable Server Streak
This question evaluates array algorithm skills, specifically recognition of sliding-window or two-pointer techniques and reasoning about time and spac...
Solve Union-Find, Graph, and Stream Problems
Solve the following independent coding problems. 1. Merge Product Categories You are given a list of tuples (productA, productB). Each tuple means the...
Minimize time for two handlers
This question evaluates algorithmic optimization skills and stateful scheduling reasoning, focusing on task assignment trade-offs and cumulative cost ...
Implement Cache and Count Components
You are asked to solve two independent coding problems in this session, each followed by a short discussion. This mirrors a 60-minute Amazon SDE codin...
Compute Latencies and Search Grid Path
You are given two coding tasks from an internship interview. Task 1: Compute Message Latency from CSV Logs Two systems, ComputeA and ComputeB, exchang...
Maximize protected population and bitwise AND
This paired problem evaluates array manipulation and resource-allocation reasoning for maximizing covered population in a constrained-movement scenari...
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...
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...
Find when failures started in log stream
This question evaluates understanding of monotonic sequences and search algorithms (such as binary search), along with algorithmic reasoning about cor...
Implement array and tree traversal tasks
This question evaluates algorithmic problem-solving and data-structure competency, specifically array-based optimization for single-trade profit and t...
Count unique Morse-code word transformations
Given an array of lowercase strings words. Each letter 'a' to 'z' has a corresponding Morse code string (standard 26-letter mapping). A word’s transfo...
Find minimum total range-increment to sort
This question evaluates algorithmic problem-solving skills in array manipulation and optimization, focusing on reasoning about range-increment operati...