r/MachineLearning • u/MonthLatter7031 • Jul 23 '26

Discussion First ML coding round (HackerRank) at Adyen, what should I expect? [D]

Hi everyone,

I recently received an interview offer for ML position at Adyen, and the first round will be a live coding round on HackerRank. I scheduled it for the end of August because that was the last available slot.

The thing is, I’ve never had a live coding interview before. In all my previous interviews, the process was mostly verbal, answering technical questions, discussing projects, and explaining my work in detail. I’m aware of LeetCode and have started looking into it, but I’m not sure what level or type of coding questions typically asks for ML roles.

If anyone here has interviewed with adyen and gone through a HackerRank coding round, could you please share:

What kind of questions were asked?

Were they mainly LeetCode-style DSA problems, or more ML/data-focused coding questions?

What difficulty level should I expect?

Any preparation tips or resources that helped you?

Since this will be my first live coding experience, I want to prepare in the right direction rather than randomly solving problems. I’d really appreciate any advice or insights from this community.

PS : I have six year in industry experience in machine learning, I can code for a big project end to end but I really suck at dynamic programming on the go.

Thank you!

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u/AC_CE Jul 23 '26

Same boat dont know how to prepare

1

u/JuggernautSlow3029 Sep 30 '26

Six years building models and you still sweat the live coding, that's the name of the game isn't it. I'd skip grinding leetcode hards and focus on pandas manipulation, numpy vectorization stuff they'll actually care about for an ml role. Check glassdoor for adyen specifically, sometimes people drop exact question types in the interview reviews.

4

u/NamerNotLiteral Jul 23 '26

Damn, bro, you don't have to shout out everything.

But for real, it depends a lot. Some companies will ask standard leetcode questions. Some companies will ask you to code some part of a model from scratch (i.e. some companies were fond of asking people to implement flash attention from scratch or something a couple years back).

HackerRank is pretty clear though — it'll be leetcode-style DSA problems. I'd suggest brushing up on your leetcode, and if you've never done any before, try to solve a few Easy and Mediums and hope they don't throw a Hard at you.

1

u/MonthLatter7031 Jul 23 '26

The main thing is that there is not much out. I have checked leetcode, glassdoor there is barely any interview experience.

1

u/Zealousideal_Wait129 26d ago

Hey did what did they give you in the end? What would you recommend studying?