Google vs MongoDB Interview Questions
Google lists 2,305 LeetCode interview questions while MongoDB lists 24. They share 23 problems — 1% of Google's bank and 96% of MongoDB's. Focus on the overlap first, then drill into 2,282 Google-only and 1 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 23 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Google and MongoDB.
Step 2 — Company-specific depth: Add Google-specific problems like Two Sum, Add Two Numbers, Trapping Rain Water 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
23 Shared Questions
High-priority problems to practice for both Google and MongoDB.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Merge Two Sorted Lists | Easy |
| Search in Rotated Sorted Array | Medium |
| LRU Cache | Medium |
| Sliding Window Maximum | Hard |
| Intersection of Two Arrays | Easy |
| Merge k Sorted Lists | Hard |
| Insert Interval | Medium |
| Text Justification | Hard |
| Word Break | Medium |
| String Compression | Medium |
| Lowest Common Ancestor of a Binary Tree | Medium |
| Clone Graph | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Course Schedule II | Medium |
| Snapshot Array | Medium |
| Word Break II | Hard |
| Time Based Key-Value Store | Medium |
| Stock Price Fluctuation | Medium |
| Design Search Autocomplete System | Hard |
| Lowest Common Ancestor of a Binary Tree III | Medium |
| Merge Two Binary Trees | Easy |
| Web Crawler Multithreaded | Medium |
Unique to Google (2,282)
Problems in Google's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Add Two Numbers | Medium |
| Trapping Rain Water | Hard |
| Median of Two Sorted Arrays | Hard |
| Longest Common Prefix | Easy |
| Palindrome Number | Easy |
| Merge Sorted Array | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Best Time to Buy and Sell Stock | Easy |
| 3Sum | Medium |
| Create Hello World Function | Easy |
| Merge Strings Alternately | Easy |
Unique to MongoDB (1)
Problems in MongoDB's list that do not appear at Google.
| Problem | Difficulty |
|---|---|
| Convert JSON String to Object | Hard |
Frequently Asked Questions
How many LeetCode questions do Google and MongoDB share?
Google and MongoDB share 23 LeetCode interview questions. 2282 problems appear only in Google's list and 1 appear only in MongoDB's list.
What topics overlap most between Google and MongoDB?
The most common shared topics between Google and MongoDB are Hash Table (10 shared questions), Array (9 shared questions), String (7 shared questions), Design (6 shared questions), Depth-First Search (6 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Google or MongoDB?
Google has 601 Easy, 1205 Medium, and 499 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 Google and MongoDB?
Start with the 23 shared problems since they cover what both companies ask most often. Then add 20 Google-specific and 1 MongoDB-specific questions to round out your prep.