Type · algorithmic
Given a list of transactions, where each transaction has a sender ID, receiver ID, and amount, write a function to calculate the net balance for each user. Users with no transactions should have a balance of 0.
Growth · Software Engineer Interview Guide
Interview language: English
How to Pass the Wave Software Engineer Interview in 2026
The Wave DNA (TL;DR)
The 'Wave We' principle guides hiring, seeking individuals who can simplify complex financial workflows for small business owners. Interviewers assess practical application in building intuitive tools, ensuring candidates align with the company's mission to empower entrepreneurs through products like Wave Deposit.
The Wave 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 Wave interview outcomes, avoid these common traps:
- Failing to identify the root cause of the bug, focusing on superficial changes.
- Focusing solely on the other person's fault.
- Describing a situation where information was actually complete.
- Not considering message queuing or asynchronous processing for scalability.
Get the full Wave 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 Wave Questions
Three real prompts pulled from our database.
Type · conflict resolution
Tell me about a time you had a significant disagreement with a colleague or manager. How did you handle it, and what was the resolution?
Type · past-experience
Describe a situation where you disagreed with a technical decision made by your team or lead. How did you handle the disagreement, and what was the result?
+ many more questions, signals, and worked examples
Sign up to unlock the full Wave grading rubric
Wave 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
Wave's mission is to help small businesses succeed. Can you tell me about a time you've been motivated by a mission-driven company or product, and how that impacted your work?
2
Coding Screen
3- 2
Type · algorithmic
Given a list of transactions, where each transaction has a sender ID, receiver ID, and amount, write a function to calculate the net balance for each user. Users with no transactions should have a balance of 0. - 3
Type · algorithmic
Implement a function that takes a list of payment requests, each with an amount and a timestamp, and returns a list of approved payments. A payment is approved if the total amount of payments from the same user within a 60-second window does not exceed $1000. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · design
Design a system to process and reconcile bank transfers for Wave users. Consider aspects like idempotency, error handling, and scalability to handle millions of transactions daily. - 5
Type · design
How would you design a real-time notification system for Wave users to alert them about new transactions, low balances, or payment confirmations? Discuss the trade-offs between different notification channels (e.g., push, email, SMS). - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · algorithmic
Implement a function to detect fraudulent transactions based on a set of rules. For example, a transaction might be flagged if it exceeds a certain amount, originates from a suspicious IP address, or occurs shortly after a series of small, rapid transactions. You'll need to manage state across multiple transactions. - 7
Type · algorithmic
Given a stream of financial data (e.g., stock prices, currency exchange rates), implement a data structure that can efficiently calculate the moving average over a configurable window size. Ensure thread-safety if multiple threads might update the stream. - + 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 cross-functional partner (e.g., engineer, designer, marketer) about a product decision. How did you approach the situation, and what was the outcome? - 9
Type · past-experience
Tell me about a time you had to make a significant technical decision with incomplete information or under tight deadlines. How did you approach it, what was the outcome, and what did you learn? - + 3 more questions in this round (sign up to unlock)
Unlock all 15 Wave 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 Wave
How Wave's DNA translates across functions. Pick your role.
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Practice Wave interviews end-to-end
Wave Mock Interview
Run a live mock interview with our AI interviewer using Wave-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Wave Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Wave interviewers grade on. Reuse them across every behavioral round.
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Wave Interview Prep Hub
The frameworks behind every Wave 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 Wave 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 Wave interview questions shows.
Given a list of transactions, where each transaction has a sender ID, receiver ID, and amount, write a function to calculate the net balance for each user. Users with no transactions should have a balance of 0.
A strong answer shows: Data structure proficiency; Algorithmic efficiency; Edge case handling.
Tell me about a time you had a significant disagreement with a colleague or manager. How did you handle it, and what was the resolution?
A strong answer shows: Calm and objective description of the conflict.; Focus on understanding different perspectives.; Demonstrates a collaborative approach to resolution..
FAQ
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