Amazon vs MongoDB Interview Questions
Amazon lists 1,968 LeetCode interview questions while MongoDB lists 24. They share 22 problems — 1% of Amazon's bank and 92% of MongoDB's. Focus on the overlap first, then drill into 1,946 Amazon-only and 2 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 22 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Amazon and MongoDB.
Step 2 — Company-specific depth: Add Amazon-specific problems like Two Sum, Trapping Rain Water, Number of Islands and MongoDB-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: MongoDB skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
22 Shared Questions
High-priority problems to practice for both Amazon and MongoDB.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Merge k Sorted Lists | Hard |
| Search in Rotated Sorted Array | Medium |
| Lowest Common Ancestor of a Binary Tree | Medium |
| Merge Two Sorted Lists | Easy |
| Course Schedule II | Medium |
| Sliding Window Maximum | Hard |
| Word Break | Medium |
| String Compression | Medium |
| Word Break II | Hard |
| Intersection of Two Arrays | Easy |
| Time Based Key-Value Store | Medium |
| Lowest Common Ancestor of a Binary Tree III | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Clone Graph | Medium |
| Insert Interval | Medium |
| Text Justification | Hard |
| Merge Two Binary Trees | Easy |
| Design Search Autocomplete System | Hard |
| Snapshot Array | Medium |
| Stock Price Fluctuation | Medium |
Unique to Amazon (1,946)
Problems in Amazon's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Trapping Rain Water | Hard |
| Number of Islands | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Group Anagrams | Medium |
| Add Two Numbers | Medium |
| Reorganize String | Medium |
| 3Sum | Medium |
| Longest Palindromic Substring | Medium |
| Container With Most Water | Medium |
| Median of Two Sorted Arrays | Hard |
Unique to MongoDB (2)
Problems in MongoDB's list that do not appear at Amazon.
| Problem | Difficulty |
|---|---|
| Convert JSON String to Object | Hard |
| Web Crawler Multithreaded | Medium |
Frequently Asked Questions
How many LeetCode questions do Amazon and MongoDB share?
Amazon and MongoDB share 22 LeetCode interview questions. 1946 problems appear only in Amazon's list and 2 appear only in MongoDB's list.
What topics overlap most between Amazon and MongoDB?
The most common shared topics between Amazon and MongoDB are Hash Table (10 shared questions), Array (9 shared questions), String (7 shared questions), Design (6 shared questions), Depth-First Search (5 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Amazon or MongoDB?
Amazon has 527 Easy, 1074 Medium, and 367 Hard questions. MongoDB has 3 Easy, 15 Medium, and 6 Hard questions. MongoDB has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Amazon and MongoDB?
Start with the 22 shared problems since they cover what both companies ask most often. Then add 20 Amazon-specific and 2 MongoDB-specific questions to round out your prep.