Epam Systems vs MongoDB Interview Questions
Epam Systems lists 46 LeetCode interview questions while MongoDB lists 24. They share 4 problems — 9% of Epam Systems's bank and 17% of MongoDB's. Focus on the overlap first, then drill into 42 Epam Systems-only and 20 MongoDB-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 4 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Epam Systems and MongoDB.
Step 2 — Company-specific depth: Add Epam Systems-specific problems like Two Sum, Longest Substring Without Repeating Characters, Minimum Operations to Make a Uni-Value Grid 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
4 Shared Questions
High-priority problems to practice for both Epam Systems and MongoDB.
| Problem | Difficulty |
|---|---|
| String Compression | Medium |
| Merge Intervals | Medium |
| LRU Cache | Medium |
| Merge Two Sorted Lists | Easy |
Unique to Epam Systems (42)
Problems in Epam Systems's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Minimum Operations to Make a Uni-Value Grid | Medium |
| Valid Parentheses | Easy |
| Move Zeroes | Easy |
| Longest Common Prefix | Easy |
| Longest Palindromic Substring | Medium |
| Merge Sorted Array | Easy |
| Valid Anagram | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Group Anagrams | Medium |
| Rotate Array | Medium |
Unique to MongoDB (20)
Problems in MongoDB's list that do not appear at Epam Systems.
| Problem | Difficulty |
|---|---|
| Word Break | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Snapshot Array | Medium |
| Intersection of Two Arrays | Easy |
| Text Justification | Hard |
| Merge k Sorted Lists | 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 |
Frequently Asked Questions
How many LeetCode questions do Epam Systems and MongoDB share?
Epam Systems and MongoDB share 4 LeetCode interview questions. 42 problems appear only in Epam Systems's list and 20 appear only in MongoDB's list.
What topics overlap most between Epam Systems and MongoDB?
The most common shared topics between Epam Systems and MongoDB are Linked List (2 shared questions), Two Pointers (1 shared questions), String (1 shared questions), Array (1 shared questions), Sorting (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Epam Systems or MongoDB?
Epam Systems has 16 Easy, 27 Medium, and 3 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 Epam Systems and MongoDB?
Start with the 4 shared problems since they cover what both companies ask most often. Then add 20 Epam Systems-specific and 20 MongoDB-specific questions to round out your prep.