Hey everyone,

I recently took the Stripe Software Engineer Intern (2025–26 Stripe University Recruiting) Online Assessment on HackerRank and wanted to share my experience and need a guidance/feedback from the ones who have already completed the OA or Interview for the same regarding the prep to be done and what to expect in the next rounds!?

The OA had one coding question (60 minutes) — not a typical DSA-style problem, but more of a system design.

The question was based on fraud detection for merchants:

1. Each merchant is linked to an MCC (Merchant Category Code) with its own fraud threshold.

2. We had to process a stream of transactions (CHARGE) and disputes (DISPUTE) in real time.

3. Fraudulent and non-fraudulent codes were given separately.

4. Merchants had to be marked as fraudulent based on thresholds — which could be integer (count-based) or float (ratio-based).

5. Disputed transactions could reverse previously marked fraud charges.

Passed 22/25 test cases on HackerRank.

The remaining few likely involved rare async edge cases like multiple disputes or out-of-order charge/dispute handling.

If you’ve taken the same OA and are expecting the next round of interview or completed the interview recently, then kindly let me know the time duration it took to receive the interview invitation and what was the experience? and how did you prepared for it? what all topics were asked?

Would really appreciate your time!