American Express DSA Interview Questions

What American Express asks in the DSA round

Amex pairs medium DSA with core CS fundamentals, SQL and a design round on payments authorisation, fraud checks and reconciliation.

Across the 29 questions on this page, the weight sits on these patterns:

• Greedy — 3 questions · read the greedy guide
• Hash Table — 3 questions
• Sliding Window — 3 questions · read the sliding window guide
• Sorting — 3 questions
• Two Pointers — 3 questions · read the two pointers guide
• Bit Manipulation — 2 questions · read the bitwise xor guide
• Dynamic Programming — 2 questions · read the dynamic programming guide
• Math — 2 questions

How to prepare for the American Express interview

1. 1. Start at the top of the list above. The patterns are ordered by how often American Express uses them, so the first two or three buy you the most coverage per hour.
2. 2. Solve by pattern, not at random. Doing eight greedy problems in a row is what makes the ninth recognisable in an interview — jumping between topics does not.
3. 3. Tick problems off as you go so the gaps are visible. The per-pattern counts tell you which American Express topic you have actually covered.
4. 4. Write the approach before the code. American Express interviews are judged on the reasoning as much as the working solution.
5. 5. Pair this with the pattern guides when a topic is new, and the system design sheet if the role is senior enough to have that round.
6. 6. If this is a campus or off-campus drive rather than a lateral move, the placement preparation guide covers the stages around the DSA round — aptitude, core subjects and the HR interview — in the order they actually happen.

American Express interview questions — FAQ

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