16 questions · from 5 interviews
Adyen interview questions
Every question candidates reported from their Adyen interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Adyen coding and DSA questions
- 01
REST API: Retrieve TV Shows by Genre
Implement a REST API using HTTP GET to retrieve information about recent television shows in a specified genre.
- 02
Swap Adjacent Elements and Maximize Sum
Given an array, you can swap adjacent elements. Find the maximum possible sum of the array after performing zero or more adjacent swaps.
- 03
CSES Problem 1750 (Variation Starting at 1)
Solve the problem from CSES problem set 1750, but with the added constraint that you always start at node 1.
- 04
Count Perfect Pairs in Array
Given an integer array, for every pair of elements (x, y) determine if it is a perfect pair based on the following conditions: min(|x - y|, |x + y|) ≤ min(|x|, |y|) max(|x - y|, |x + y|) ≥ max(|x|, |y|) Return the total number of such perfect pairs in the…
Medium · From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 05
Maximize Sum of Strengths with Limited Swaps
Given an array arr of n integers, you may repeatedly choose an index i (0 ≤ i arr[i] with arr[i+1] . Each element can be swapped at most once in the entire process. The strength of index i is defined as arr[i] (i + 1) (0‑based index with a 1‑based…
Medium · From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 06
Find the Tree Diameter
Given a binary tree, find its diameter – the length (in number of nodes) of the longest path between any two nodes in the tree.
Medium · From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 07
Credit Card Provider Detection
Build a system where the user inputs a credit card number and the program detects, based on predefined number ranges, which credit card provider (e.g., Visa, MasterCard, Amex) the card belongs to.
Medium · From [Bangalore] Adyen Interview Experience
- 08
- 09
Bellman-Ford with K-Length Span
Implement the Bellman-Ford algorithm to find the shortest path with a constraint on the number of edges (k length span) to reach a destination.
From Adyen Assessment
Adyen system design questions
- 01
Reward the 1,000,000th Visitor
Adyen is running a marketing campaign and wants to reward the 1,000,000th visitor to the campaign page. Design a system that can reliably identify and reward the millionth unique visitor.
From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 02
IPL Ticket Booking Management System Design
Design a ticket booking management system for the Indian Premier League (IPL). The design should cover requirements gathering, core entities, core APIs, and high‑level architecture, addressing scalability, concurrency and reliability concerns.
Adyen behavioural and HR questions
- 01
Behavioral: Project You Are Most Proud Of
Explain the project you are most proud of, focusing on your role, challenges faced, and the impact of the outcome.
From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 02
Behavioral: Handling Disagreement
Describe a situation where you had a disagreement with a teammate or stakeholder, how you addressed it, and the result.
From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 03
Behavioral: Managing Stakeholders
Provide an example of a time you managed multiple stakeholders, how you prioritized their needs, and what the outcome was.
From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
- 04
Behavioral: Why Adyen?
Explain why you are interested in joining Adyen and what attracts you to the company.
From Detailed Adyen Backend Interview Experience L4| Bangalore | 2026 - Rejected
Adyen other questions
- 01
HTTP Endpoint Parsing
Calling an open HTTP endpoint and parsing its response.
Adyen interview questions FAQ
What questions are asked in Adyen interviews?
Candidates reported 16 distinct questions across 5 Adyen interviews. 9 coding and DSA questions, 2 system design questions, 4 behavioural and HR questions, 1 other questions.