Microsoft vs MongoDB Interview Questions
Microsoft lists 192 LeetCode interview questions while MongoDB lists 24. They share 12 problems — 6% of Microsoft's bank and 50% of MongoDB's. Focus on the overlap first, then drill into 180 Microsoft-only and 12 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 12 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Microsoft and MongoDB.
Step 2 — Company-specific depth: Add Microsoft-specific problems like Two Sum, Merge Sorted Array, Longest Substring Without Repeating Characters 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
12 Shared Questions
High-priority problems to practice for both Microsoft and MongoDB.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Search in Rotated Sorted Array | Medium |
| Merge Two Sorted Lists | Easy |
| Merge k Sorted Lists | Hard |
| Sliding Window Maximum | Hard |
| LRU Cache | Medium |
| Intersection of Two Arrays | Easy |
| Course Schedule II | Medium |
| Word Break | Medium |
| Text Justification | Hard |
| Insert Interval | Medium |
| Lowest Common Ancestor of a Binary Tree | Medium |
Unique to Microsoft (180)
Problems in Microsoft's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Merge Sorted Array | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Add Two Numbers | Medium |
| Longest Palindromic Substring | Medium |
| Trapping Rain Water | Hard |
| Single Element in a Sorted Array | Medium |
| Median of Two Sorted Arrays | Hard |
| Valid Parentheses | Easy |
| 3Sum | Medium |
| Maximum Subarray | Medium |
| Group Anagrams | Medium |
Unique to MongoDB (12)
Problems in MongoDB's list that do not appear at Microsoft.
| Problem | Difficulty |
|---|---|
| Implement Trie (Prefix Tree) | Medium |
| Snapshot Array | Medium |
| Convert JSON String to Object | Hard |
| Web Crawler Multithreaded | Medium |
| Stock Price Fluctuation | Medium |
| Merge Two Binary Trees | Easy |
| Design Search Autocomplete System | Hard |
| Lowest Common Ancestor of a Binary Tree III | Medium |
| String Compression | Medium |
| Word Break II | Hard |
| Clone Graph | Medium |
| Time Based Key-Value Store | Medium |
Frequently Asked Questions
How many LeetCode questions do Microsoft and MongoDB share?
Microsoft and MongoDB share 12 LeetCode interview questions. 180 problems appear only in Microsoft's list and 12 appear only in MongoDB's list.
What topics overlap most between Microsoft and MongoDB?
The most common shared topics between Microsoft and MongoDB are Array (7 shared questions), Linked List (3 shared questions), Hash Table (3 shared questions), Sorting (2 shared questions), Binary Search (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Microsoft or MongoDB?
Microsoft has 55 Easy, 109 Medium, and 28 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 Microsoft and MongoDB?
Start with the 12 shared problems since they cover what both companies ask most often. Then add 20 Microsoft-specific and 12 MongoDB-specific questions to round out your prep.