eBay vs MongoDB Interview Questions
eBay lists 62 LeetCode interview questions while MongoDB lists 24. They share 5 problems — 8% of eBay's bank and 21% of MongoDB's. Focus on the overlap first, then drill into 57 eBay-only and 19 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 5 overlapping problems first. These are the highest-yield questions for candidates interviewing at both eBay and MongoDB.
Step 2 — Company-specific depth: Add eBay-specific problems like Remove One Element to Make the Array Strictly Increasing, Alternating Digit Sum, Partition Equal Subset Sum 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
5 Shared Questions
High-priority problems to practice for both eBay and MongoDB.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Time Based Key-Value Store | Medium |
| Merge k Sorted Lists | Hard |
| Clone Graph | Medium |
Unique to eBay (57)
Problems in eBay's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Remove One Element to Make the Array Strictly Increasing | Easy |
| Alternating Digit Sum | Easy |
| Partition Equal Subset Sum | Medium |
| Binary Gap | Easy |
| Minimize Maximum Pair Sum in Array | Medium |
| Minimum Window Subsequence | Hard |
| Design Skiplist | Hard |
| Subtree of Another Tree | Easy |
| Two Sum | Easy |
| Spiral Matrix | Medium |
| Top K Frequent Elements | Medium |
| Open the Lock | Medium |
Unique to MongoDB (19)
Problems in MongoDB's list that do not appear at eBay.
| Problem | Difficulty |
|---|---|
| Word Break | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Snapshot Array | Medium |
| Intersection of Two Arrays | Easy |
| Text Justification | Hard |
| Convert JSON String to Object | Hard |
| Insert Interval | Medium |
| Web Crawler Multithreaded | Medium |
| Stock Price Fluctuation | Medium |
| Course Schedule II | Medium |
| Merge Two Binary Trees | Easy |
| Sliding Window Maximum | Hard |
Frequently Asked Questions
How many LeetCode questions do eBay and MongoDB share?
eBay and MongoDB share 5 LeetCode interview questions. 57 problems appear only in eBay's list and 19 appear only in MongoDB's list.
What topics overlap most between eBay and MongoDB?
The most common shared topics between eBay and MongoDB are Hash Table (3 shared questions), Linked List (2 shared questions), Design (2 shared questions), Doubly-Linked List (1 shared questions), Array (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: eBay or MongoDB?
eBay has 10 Easy, 39 Medium, and 13 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 eBay and MongoDB?
Start with the 5 shared problems since they cover what both companies ask most often. Then add 20 eBay-specific and 19 MongoDB-specific questions to round out your prep.