ByteDance vs MongoDB Interview Questions
ByteDance lists 64 LeetCode interview questions while MongoDB lists 24. They share 7 problems — 11% of ByteDance's bank and 29% of MongoDB's. Focus on the overlap first, then drill into 57 ByteDance-only and 17 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 7 overlapping problems first. These are the highest-yield questions for candidates interviewing at both ByteDance and MongoDB.
Step 2 — Company-specific depth: Add ByteDance-specific problems like Remove Duplicate Letters, Smallest Subsequence of Distinct Characters, First Day Where You Have Been in All the Rooms 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
7 Shared Questions
High-priority problems to practice for both ByteDance and MongoDB.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Search in Rotated Sorted Array | Medium |
| Merge k Sorted Lists | Hard |
| Clone Graph | Medium |
| Sliding Window Maximum | Hard |
| Text Justification | Hard |
Unique to ByteDance (57)
Problems in ByteDance's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Remove Duplicate Letters | Medium |
| Smallest Subsequence of Distinct Characters | Medium |
| First Day Where You Have Been in All the Rooms | Medium |
| Number of Islands | Medium |
| Course Schedule | Medium |
| Combination Sum | Medium |
| Basic Calculator II | Medium |
| Shortest Bridge | Medium |
| House Robber | Medium |
| Maximal Square | Medium |
| Regular Expression Matching | Hard |
| Top K Frequent Elements | Medium |
Unique to MongoDB (17)
Problems in MongoDB's list that do not appear at ByteDance.
| Problem | Difficulty |
|---|---|
| Word Break | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Snapshot Array | Medium |
| Intersection of Two Arrays | Easy |
| 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 |
| Lowest Common Ancestor of a Binary Tree | Medium |
| Design Search Autocomplete System | Hard |
Frequently Asked Questions
How many LeetCode questions do ByteDance and MongoDB share?
ByteDance and MongoDB share 7 LeetCode interview questions. 57 problems appear only in ByteDance's list and 17 appear only in MongoDB's list.
What topics overlap most between ByteDance and MongoDB?
The most common shared topics between ByteDance and MongoDB are Array (4 shared questions), Hash Table (2 shared questions), Linked List (2 shared questions), Heap (Priority Queue) (2 shared questions), Design (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: ByteDance or MongoDB?
ByteDance has 4 Easy, 51 Medium, and 9 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 ByteDance and MongoDB?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 20 ByteDance-specific and 17 MongoDB-specific questions to round out your prep.