Meta vs MongoDB Interview Questions
Meta lists 217 LeetCode interview questions while MongoDB lists 24. They share 13 problems — 6% of Meta's bank and 54% of MongoDB's. Focus on the overlap first, then drill into 204 Meta-only and 11 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 13 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Meta and MongoDB.
Step 2 — Company-specific depth: Add Meta-specific problems like Minimum Remove to Make Valid Parentheses, Valid Word Abbreviation, Binary Tree Vertical Order Traversal 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
13 Shared Questions
High-priority problems to practice for both Meta and MongoDB.
| Problem | Difficulty |
|---|---|
| Lowest Common Ancestor of a Binary Tree III | Medium |
| Merge Intervals | Medium |
| Lowest Common Ancestor of a Binary Tree | Medium |
| Merge k Sorted Lists | Hard |
| Clone Graph | Medium |
| LRU Cache | Medium |
| Search in Rotated Sorted Array | Medium |
| Merge Two Sorted Lists | Easy |
| Insert Interval | Medium |
| Text Justification | Hard |
| Word Break | Medium |
| Word Break II | Hard |
| Course Schedule II | Medium |
Unique to Meta (204)
Problems in Meta's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Minimum Remove to Make Valid Parentheses | Medium |
| Valid Word Abbreviation | Easy |
| Binary Tree Vertical Order Traversal | Medium |
| Valid Palindrome II | Easy |
| Merge Sorted Array | Easy |
| Kth Largest Element in an Array | Medium |
| Pow(x, n) | Medium |
| Binary Tree Right Side View | Medium |
| Simplify Path | Medium |
| Basic Calculator II | Medium |
| Two Sum | Easy |
| Find Peak Element | Medium |
Unique to MongoDB (11)
Problems in MongoDB's list that do not appear at Meta.
| Problem | Difficulty |
|---|---|
| Implement Trie (Prefix Tree) | Medium |
| Snapshot Array | Medium |
| Intersection of Two Arrays | Easy |
| Convert JSON String to Object | Hard |
| Web Crawler Multithreaded | Medium |
| Stock Price Fluctuation | Medium |
| Merge Two Binary Trees | Easy |
| Sliding Window Maximum | Hard |
| Design Search Autocomplete System | Hard |
| String Compression | Medium |
| Time Based Key-Value Store | Medium |
Frequently Asked Questions
How many LeetCode questions do Meta and MongoDB share?
Meta and MongoDB share 13 LeetCode interview questions. 204 problems appear only in Meta's list and 11 appear only in MongoDB's list.
What topics overlap most between Meta and MongoDB?
The most common shared topics between Meta and MongoDB are Array (6 shared questions), Hash Table (5 shared questions), Depth-First Search (3 shared questions), Linked List (3 shared questions), String (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Meta or MongoDB?
Meta has 52 Easy, 132 Medium, and 33 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 Meta and MongoDB?
Start with the 13 shared problems since they cover what both companies ask most often. Then add 20 Meta-specific and 11 MongoDB-specific questions to round out your prep.