Apple vs MongoDB Interview Questions
Apple lists 300 LeetCode interview questions while MongoDB lists 24. They share 19 problems — 6% of Apple's bank and 79% of MongoDB's. Focus on the overlap first, then drill into 281 Apple-only and 5 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 19 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Apple and MongoDB.
Step 2 — Company-specific depth: Add Apple-specific problems like Two Sum, Number of Islands, Best Time to Buy and Sell Stock 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
19 Shared Questions
High-priority problems to practice for both Apple and MongoDB.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Course Schedule II | Medium |
| Merge k Sorted Lists | Hard |
| Time Based Key-Value Store | Medium |
| Lowest Common Ancestor of a Binary Tree | Medium |
| Snapshot Array | Medium |
| Merge Two Sorted Lists | Easy |
| Word Break | Medium |
| String Compression | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Search in Rotated Sorted Array | Medium |
| Text Justification | Hard |
| Insert Interval | Medium |
| Sliding Window Maximum | Hard |
| Lowest Common Ancestor of a Binary Tree III | Medium |
| Intersection of Two Arrays | Easy |
| Web Crawler Multithreaded | Medium |
| Clone Graph | Medium |
Unique to Apple (281)
Problems in Apple's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Number of Islands | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Design Hit Counter | Medium |
| Longest Common Prefix | Easy |
| Rotate Array | Medium |
| Reverse Linked List | Easy |
| Valid Sudoku | Medium |
| Group Anagrams | Medium |
| Top K Frequent Elements | Medium |
| Course Schedule | Medium |
| Valid Parentheses | Easy |
Unique to MongoDB (5)
Problems in MongoDB's list that do not appear at Apple.
| Problem | Difficulty |
|---|---|
| Convert JSON String to Object | Hard |
| Stock Price Fluctuation | Medium |
| Merge Two Binary Trees | Easy |
| Design Search Autocomplete System | Hard |
| Word Break II | Hard |
Frequently Asked Questions
How many LeetCode questions do Apple and MongoDB share?
Apple and MongoDB share 19 LeetCode interview questions. 281 problems appear only in Apple's list and 5 appear only in MongoDB's list.
What topics overlap most between Apple and MongoDB?
The most common shared topics between Apple and MongoDB are Hash Table (8 shared questions), Array (8 shared questions), String (5 shared questions), Design (4 shared questions), Depth-First Search (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Apple or MongoDB?
Apple has 76 Easy, 178 Medium, and 46 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 Apple and MongoDB?
Start with the 19 shared problems since they cover what both companies ask most often. Then add 20 Apple-specific and 5 MongoDB-specific questions to round out your prep.