Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected

I applied through the job portal and got a response next day. The role was for an L4 backend role java. I have 4.5 years of experience.

Overall there were 6 rounds.

Round 1 - HR Screen - Virtual Interview

• Initial introduction
• Was asked to talk about one of my recent projects and how I have navigated a disagreement (this is a follow‑up question).
• Finally the recruiter asked, Why Adyen?
• At end he said he would share me the OA link and told to finish it in under 3 days.

Round 2 - Online Assessment

• Hackerrank link - 1hr duration
• 2 leetcode medium questions

Question 1:

Given an array‑based problem where, for every pair (x, y), I had to determine whether it was a perfect pair based on the following conditions:

• min(|x‑y|, |x+y|) ≤ min(|x|, |y|)
• max(|x‑y|, |x+y|) ≥ max(|x|, |y|)

The task was to count the total number of such pairs in the array.

Question 2:

Given an array arr of n integers, you can perform the following operation any number of times:

Choose any index i (0 ≤ i < n‑1) and swap arr[i] and arr[i+1].
Constraint: Each element in the array can be swapped at most once during the entire process.

The strength of an index i is defined as:

Strength(i) = arr[i] * (i + 1) (using 0‑based indexing for the array, but 1‑based multiplier for the position strength).

Return the maximum possible sum of strengths of all indices after applying optimal swaps.

Round 3 - DSA Round - Virtual Interview

• Introductions
• Explain a past project
• DSA Question: Find the Tree Diameter
• There was a second question as well, but we didn't discuss it due to lack of time.

Round 4 - System Design - Virtual Interview

Question: Adyen is running a marketing campaign and wants to reward the 1,000,000th visitor to the campaign page.

Round 5 - Leadership Round - In person

I felt this was the most important round of all. The Head of Engineering and the Hiring Manager had taken this round in Adyen office.

Questions were standard:

• What project are you most proud of?
• Was there any disagreement?
• Instances where you managed stakeholders.
• Why Adyen?

I didn't structure my answers in STAR format, so got rejected in this round.

The last round was a Global Leadership Round, the interviewer would be from one of the overseas teams. I didn't give this round.