American Express Coding Interview Questions
We track 24 coding questions asked at American Express, tagged with the algorithms and concepts they test. The most common: Array, Hash Table, String, Two Pointers, Math.
Browse all 24 American Express questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Array25.5%
- Hash Table13.5%
- String13.5%
- Two Pointers7.1%
- Math5.9%
- Sorting5.2%
- Bit Manipulation4.5%
- Greedy4.2%
- Dynamic Programming2.9%
- Sliding Window2.4%
- Other (12)15.0%
How many questions involve each concept
Share of all 24 tracked American Express questions that touch each concept. Questions usually involve several, so these overlap.
- Array66.7%
- Hash Table37.5%
- String29.2%
- Two Pointers20.8%
- Math16.7%
- Sorting16.7%
- Bit Manipulation12.5%
- Greedy12.5%
- Binary Search8.3%
- Dynamic Programming8.3%
- Sliding Window8.3%
- Backtracking4.2%
Where American Express differs from the average company
Concept weight at American Express relative to the average across all companies we track. Green means American Express leans on it harder than most.
- Bit Manipulation2.8×
- Hash Table2.0×
- Two Pointers2.0×
- Sliding Window1.6×
- Binary Search0.70×
- Dynamic Programming0.47×
American Express specialties
Concepts that show up at American Express but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 24 tracked American Express questions.
- Junior38% (9)
- Mid/Senior46% (11)
- Staff17% (4)
Every concept in American Express interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Array | 16 | 66.7% | 25.5% |
| Hash Table | 9 | 37.5% | 13.5% |
| String | 7 | 29.2% | 13.5% |
| Two Pointers | 5 | 20.8% | 7.1% |
| Math | 4 | 16.7% | 5.9% |
| Sorting | 4 | 16.7% | 5.2% |
| Bit Manipulation | 3 | 12.5% | 4.5% |
| Greedy | 3 | 12.5% | 4.2% |
| Binary Search | 2 | 8.3% | 2.1% |
| Dynamic Programming | 2 | 8.3% | 2.9% |
| Sliding Window | 2 | 8.3% | 2.4% |
| Backtracking | 1 | 4.2% | 2.1% |
| Combinatorics | 1 | 4.2% | 1.0% |
| Counting | 1 | 4.2% | 1.0% |
| Enumeration | 1 | 4.2% | 1.4% |
| Heap (Priority Queue) | 1 | 4.2% | 1.0% |
| Linked List | 1 | 4.2% | 1.4% |
| Monotonic Stack | 1 | 4.2% | 0.8% |
| Number Theory | 1 | 4.2% | 1.0% |
| Segment Tree | 1 | 4.2% | 1.0% |
| Stack | 1 | 4.2% | 0.8% |
| Trie | 1 | 4.2% | 1.4% |
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