Type · conflict resolution
Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?
How to Pass the Brex Software Engineer Interview in 2026
The Brex DNA (TL;DR)
The bar-raiser round at Brex rigorously evaluates a candidate's ability to simplify complex financial systems, demonstrating a clear path from strategy to execution. They seek individuals who embody the 'Now Brex Mode' of rapid, impactful delivery.
The Brex 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 Brex interview outcomes, avoid these common traps:
- Assuming perfect data and not designing for reconciliation failures or data inconsistencies.
- Vague description of the bug or the debugging process.
- Incorrectly handling date range comparisons (e.g., off-by-one errors).
- Introducing new bugs while attempting to fix the original one.
Get the full Brex playbook, free
Every round, the exact grading rubric interviewers score against, all the questions, and unlimited mock-interview practice. Free account, no credit card.
Test Yourself: Real Brex Questions
Three real prompts pulled from our database.
Type · algorithmic
Design and implement a data structure that supports adding a number, removing a number, and retrieving a random number from the collection in average O(1) time. Assume all numbers are unique.
Type · coding
Write a function to validate if a given string represents a valid credit card number according to the Luhn algorithm. Ensure your implementation is robust and handles various input formats.
+ many more questions, signals, and worked examples
Sign up to unlock the full Brex grading rubric
Brex Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 15 questions shown
1
Recruiter Screen
1- 1
Type · motivation
What specifically about Brex's mission and the fintech space excites you as a software engineer?
2
Coding Screen
3- 2
Type · algorithmic
Given a list of financial transactions, each with a timestamp, amount, and category, write a function to calculate the total spending for a given category within a specified date range. Assume transactions are not necessarily sorted by time. - 3
Type · algorithmic
Implement a function that takes a list of stock prices for a given day and returns the maximum profit that could have been made by buying and selling the stock once. You must buy before you sell. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · system-design
Design a system to detect and flag potentially fraudulent credit card transactions in real-time for Brex cardholders. Consider scalability, latency, and accuracy. - 5
Type · system-design
How would you design a rate limiter for Brex's API to prevent abuse and ensure service availability? Discuss different algorithms and their trade-offs. - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · algorithmic
Given a binary tree where each node represents a financial account balance, and edges represent transfers between accounts, find the minimum number of transfers required to balance all accounts to zero. You can transfer any amount between accounts. - 7
Type · debugging
Here is a snippet of code that processes user payment data. It's producing incorrect aggregate results. Debug and fix the code, explaining your thought process. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
5- 8
Type · conflict resolution
Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution? - 9
Type · influence
Tell me about a time you had to influence someone to adopt a new idea or change their approach, especially when they were resistant. How did you go about it? - + 3 more questions in this round (sign up to unlock)
Unlock all 15 Brex 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 Brex
How Brex's DNA translates across functions. Pick your role.
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Practice Brex interviews end-to-end
Brex Mock Interview
Run a live mock interview with our AI interviewer using Brex-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Brex Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Brex interviewers grade on. Reuse them across every behavioral round.
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Brex Interview Prep Hub
The frameworks behind every Brex 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 Brex 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 Brex interview questions shows.
Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?
A strong answer shows: Approaches conflict with a focus on understanding and resolution, not winning.; Demonstrates active listening and empathy towards the other party.; Focuses on finding a mutually agreeable solution or path forward..
Design and implement a data structure that supports adding a number, removing a number, and retrieving a random number from the collection in average O(1) time. Assume all numbers are unique.
A strong answer shows: Data structure design; Time complexity analysis; Trade-off evaluation; Handling unique elements.
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