Type · Algorithmic
Implement a function to calculate the shortest path for a user to travel between multiple locations (e.g., home, work, gym) using public transport data. Assume you have access to a graph representing transport routes and times.
Growth · Software Engineer Interview Guide
Sign up to see ATSHeadquartered in NetherlandsInterview language: English
How to Pass the bunq Software Engineer Interview in 2026
The bunq DNA (TL;DR)
bunq values pragmatic builders who can ship. They look for candidates who can articulate trade-offs and demonstrate impact, often through the lens of their 'Freedom of Choice' principle, rather than just theoretical knowledge.
The bunq 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 bunq interview outcomes, avoid these common traps:
- Inefficiently storing timestamps for each user.
- Inefficiently scanning the entire transaction history for each new transaction.
- Not demonstrating an understanding of bunq's mission or product.
- Describing a generic cleanup project rather than a direct intervention in a production bottleneck
Test Yourself: Real bunq Questions
Three real prompts pulled from our database.
Type · System Design
How would you design a system to detect and prevent duplicate payments or transfers within bunq? Consider edge cases and potential race conditions.
Type · Ownership
At bunq, we prioritize shipping features rapidly to our users. Tell me about a time you identified a technical debt or a performance bottleneck in your codebase that was slowing down production deployments. What specific trade-offs did you make to resolve it while maintaining our release velocity?
+ many more questions, signals, and worked examples
Sign up to unlock the full bunq grading rubric
bunq Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 13 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Why are you interested in working at bunq, a fintech company focused on growth and user experience, as a Software Engineer?
2
Coding Screen
3- 2
Type · Algorithmic
Given a list of user transactions, each with a timestamp and amount, write a function to calculate the daily spending limit for a user, considering a rolling 24-hour window. Assume the limit is $5000. - 3
Type · Algorithmic
Implement a function to detect fraudulent transaction patterns. Given a stream of transactions and a set of known fraud patterns (e.g., multiple small transactions in rapid succession from different locations), identify potential fraud. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · System Design
Design a system to automatically categorize user transactions (e.g., 'Groceries', 'Travel', 'Utilities') based on merchant information and transaction history. How would you handle ambiguity and user corrections? - 5
Type · System Design
Design a real-time notification system for bunq users, alerting them about important events like large transactions, low balances, or potential security issues. Consider scalability and reliability. - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · Debugging
A user reports that their balance is sometimes incorrect after making a purchase. Here's a simplified code snippet of the balance update logic. Find and fix the bug. - 7
Type · Algorithmic
Implement a function to calculate the shortest path for a user to travel between multiple locations (e.g., home, work, gym) using public transport data. Assume you have access to a graph representing transport routes and times. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 8
Type · Ownership
At bunq, we prioritize shipping features rapidly to our users. Tell me about a time you identified a technical debt or a performance bottleneck in your codebase that was slowing down production deployments. What specific trade-offs did you make to resolve it while maintaining our release velocity? - 9
Type · Technical Challenge
Describe the most challenging technical problem you've faced in a previous role. How did you approach it, what did you learn, and what was the resolution? - + 1 more questions in this round (sign up to unlock)
Unlock all 13 bunq 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 bunq
How bunq's DNA translates across functions. Pick your role.
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Practice bunq interviews end-to-end
bunq Mock Interview
Run a live mock interview with our AI interviewer using bunq-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for bunq Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals bunq interviewers grade on. Reuse them across every behavioral round.
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bunq Interview Prep Hub
The frameworks behind every bunq 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 bunq 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 bunq interview questions shows.
Implement a function to calculate the shortest path for a user to travel between multiple locations (e.g., home, work, gym) using public transport data. Assume you have access to a graph representing transport routes and times.
A strong answer shows: Knowledge of graph algorithms.; Ability to model real-world problems with graphs.; Optimization for performance..
How would you design a system to detect and prevent duplicate payments or transfers within bunq? Consider edge cases and potential race conditions.
A strong answer shows: Understanding of idempotency and distributed transactions.; Strategies for handling race conditions and concurrency.; Robust error handling and recovery mechanisms..
Frequently asked questions
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