Type · Algorithm
Given a list of financial transactions, each with a timestamp and an amount, write a function to calculate the total transaction volume within a given time window (e.g., last 5 minutes). Assume transactions arrive in a stream.
Enterprise · Software Engineer Interview Guide
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How to Pass the Nexi Software Engineer Interview in 2026
The Nexi DNA (TL;DR)
Nexi values candidates demonstrating strong analytical and problem-solving skills within complex fintech environments, particularly understanding payment systems, security, and digital transformation. They look for collaborative, results-driven individuals aligned with their innovation in European digital payments.
The Nexi Interview Loop
Your onsite loop will typically consist of 5 rounds.
- 1
Round 1
Recruiter ScreenMotivation, role fit, logistics. - 2
Round 2
Coding ScreenLeetCode-medium algorithmic problems under time pressure. - 3
Round 3
System DesignDistributed systems, trade-offs at scale, architecture under constraints. - 4
Round 4
Onsite CodingLeetCode-hard, debugging, code clarity, edge cases. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of Nexi interview outcomes, avoid these common traps:
- Overlooking the complexity of maintaining service continuity during the migration
- Using inefficient methods instead of a stack.
- Claiming to know everything or not admitting to learning.
- Incorrect handling of cache eviction logic.
Test Yourself: Real Nexi Questions
Three real prompts pulled from our database.
Type · Debugging
Here is a piece of code intended to calculate the average transaction value per user. It has a subtle bug. Find and fix it. Explain your debugging process.
Type · Scalability
How would you design a system to detect and prevent fraudulent credit card transactions in real-time? Discuss the components, data flow, and potential bottlenecks.
+ many more questions, signals, and worked examples
Sign up to unlock the full Nexi grading rubric
Nexi Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 14 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Why are you interested in joining Nexi, and what specifically about our work in the fintech space excites you as a software engineer?
2
Coding Screen
3- 2
Type · Algorithm
Given a list of financial transactions, each with a timestamp and an amount, write a function to calculate the total transaction volume within a given time window (e.g., last 5 minutes). Assume transactions arrive in a stream. - 3
Type · Data Structure
Implement a Least Recently Used (LRU) cache for storing recent payment authorization tokens. The cache should have a fixed capacity and evict the oldest token when full. - + 1 more questions in this round (sign up to unlock)
3
System Design
4- 4
Type · API Design
Design an API for a real-time payment processing system. Consider idempotency, error handling, security, and scalability for handling millions of transactions per day. - 5
Type · Scalability
How would you design a system to detect and prevent fraudulent credit card transactions in real-time? Discuss the components, data flow, and potential bottlenecks. - + 2 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · Algorithm
Given a list of stock trades with timestamps, prices, and volumes, find the maximum profit that could have been made by buying and selling a single stock once. Assume you must buy before you sell. - 7
Type · Debugging
Here is a piece of code intended to calculate the average transaction value per user. It has a subtle bug. Find and fix it. Explain your debugging process. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 8
Type · Conflict Resolution
In our payment processing architecture, we often have to choose between strict data consistency and high availability during cross-border settlement. Describe a time you had to advocate for a specific technical trade-off when your team was split on the approach. How did you quantify the impact of your preferred path versus the alternative? - 9
Type · Ownership
Nexi operates at a massive scale across Europe. Tell us about a time you identified a latent bottleneck in a legacy payment gateway or a redundant process in our deployment pipeline that was causing performance degradation. How did you lead the effort to modernize that specific component while ensuring zero downtime for our merchants? - + 1 more questions in this round (sign up to unlock)
Unlock all 14 Nexi questions, free
No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.
Interview tracks at Nexi
How Nexi's DNA translates across functions. Pick your role.
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Practice Nexi interviews end-to-end
Nexi Mock Interview
Run a live mock interview with our AI interviewer using Nexi-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Nexi Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Nexi interviewers grade on. Reuse them across every behavioral round.
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Nexi Interview Prep Hub
The frameworks behind every Nexi round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
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Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Nexi interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
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Sample answers
What a strong answer to these Nexi interview questions shows.
Given a list of financial transactions, each with a timestamp and an amount, write a function to calculate the total transaction volume within a given time window (e.g., last 5 minutes). Assume transactions arrive in a stream.
A strong answer shows: Efficient data structure selection.; Correct handling of time-based filtering.; Code clarity and correctness..
Here is a piece of code intended to calculate the average transaction value per user. It has a subtle bug. Find and fix it. Explain your debugging process.
A strong answer shows: Systematic debugging methodology.; Ability to identify logical errors or off-by-one errors.; Clear explanation of the bug and the fix..
Frequently asked questions
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