American Express vs Epam Systems Interview Questions
American Express lists 23 LeetCode interview questions while Epam Systems lists 46. They share 7 problems — 30% of American Express's bank and 15% of Epam Systems's. Focus on the overlap first, then drill into 16 American Express-only and 39 Epam Systems-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 American Express and Epam Systems.
Step 2 — Company-specific depth: Add American Express-specific problems like Minimum Deletions to Make Character Frequencies Unique, Maximum Equal Frequency, Divide an Array Into Subarrays With Minimum Cost II and Epam Systems-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: American Express 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 American Express and Epam Systems.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Valid Anagram | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Best Time to Buy and Sell Stock | Easy |
| 3Sum | Medium |
| Rotate Array | Medium |
| Longest Common Prefix | Easy |
Unique to American Express (16)
Problems in American Express's list that do not appear at Epam Systems.
Unique to Epam Systems (39)
Problems in Epam Systems's list that do not appear at American Express.
| Problem | Difficulty |
|---|---|
| Minimum Operations to Make a Uni-Value Grid | Medium |
| Valid Parentheses | Easy |
| Move Zeroes | Easy |
| Longest Palindromic Substring | Medium |
| Merge Sorted Array | Easy |
| Group Anagrams | Medium |
| Reverse String | Easy |
| House Robber | Medium |
| Partition Equal Subset Sum | Medium |
| Longest Consecutive Sequence | Medium |
| String Compression | Medium |
| Trapping Rain Water | Hard |
Frequently Asked Questions
How many LeetCode questions do American Express and Epam Systems share?
American Express and Epam Systems share 7 LeetCode interview questions. 16 problems appear only in American Express's list and 39 appear only in Epam Systems's list.
What topics overlap most between American Express and Epam Systems?
The most common shared topics between American Express and Epam Systems are Array (5 shared questions), Hash Table (3 shared questions), String (3 shared questions), Sorting (2 shared questions), Two Pointers (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: American Express or Epam Systems?
American Express has 8 Easy, 12 Medium, and 3 Hard questions. Epam Systems has 16 Easy, 27 Medium, and 3 Hard questions. American Express has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both American Express and Epam Systems?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 16 American Express-specific and 20 Epam Systems-specific questions to round out your prep.