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AdyenStaff · Software Engineer · June 2025 · USA · Offer

Adyen Staff Engineer: payments system design and the Adyen Formula

By an anonymous memberPublished 11 September 2026
9

The first round was a recruiter call which was very standard. They just want to understand why you are applying to Adyen.

The next round was a HackerRank question that was pretty tough. I managed to get it in the end. If you know Design Hit Counter then you will be fine but otherwise it can be tough.

The next round was a system design and it was to design a payments system. They say not having prior knowledge about payments is fine but I don't know how you could pass this round without having studied this question so definitely practice it first!

The next was another behavioural culture interview. They ask about the Adyen Formula so definitely know this going into it. I remember they asked me:

Describe a time I disagreed with a manager, what I did, and what was the end result.

The final round was a Leadership cultural interview with the CTO which was pretty cool and we again spoke about the Adyen Formula and previous projects I had worked on.

I got the offer and it makes sense why they put so much emphasis on the cultural interviews. It's a pretty great place to work and everyone I have worked with so far has been very nice.

9 comments

    • Nora NguyenPremium

      Can confirm the Adyen Formula point. Every behavioral question I got mapped to one of the principles, read it the night before

    • Daniel KhanPremium

      How deep did they go on the payments design? Was it mostly boxes and arrows or did they get into idempotency and retries?

      • patient-kiwi-7080Author

        Pretty deep, started with the merchant to acquirer flow, then straight into "this call timed out, did the customer get charged twice?". Have an answer ready for that one.

    • Thomas WhitePremium

      Design Hit Counter for a payments company is not what I would have guessed. Good to know, thanks for the write up.

    • Samuel DavisPremium

      congrats! adyen is on my list of companies im going to apply for so this is really useful. how long did you get for the hackerrank?

      • patient-kiwi-7080Author

        @Samuel Davis 40 mins for one question, so plenty of time if you know the pattern.

    • zesty-vole-1971

      Was the system design in person or remote? Trying to figure out if I need to practise whiteboarding or if excalidraw is fine.

    • Camila PatelPremium

      found this through google, still one of the better adyen breakdowns out there. thanks

    • Marcus ClarkPremium

      saving this, interviewing there in soon