Type · algorithmic
Implement a function that takes a list of user IDs and their associated spending limits, and returns a list of users who have exceeded their spending limit. Assume spending data is available in a separate structure.
Growth · Software Engineer Interview Guide
Interview language: English
How to Pass the Float Software Engineer Interview in 2026
The Float DNA (TL;DR)
Candidates for Float are evaluated on their capacity to innovate within financial technology, demonstrating expertise with products like `Float Funding` and strategic insights into the fintech landscape.
The Float 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 Float interview outcomes, avoid these common traps:
- Blaming the other party or taking an overly adversarial stance.
- Blaming the other person without taking responsibility for their own actions or communication.
- Incorrectly comparing limits and actual spending.
- Not considering the need for a flexible categorization engine (rules vs. ML).
Get the full Float 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 Float Questions
Three real prompts pulled from our database.
Type · motivation
What interests you about working at Float, specifically within the fintech space, and how do you see your skills contributing to our mission of simplifying business finances?
Type · architecture
Design a system to detect and flag potentially fraudulent transactions in real-time for Float's users. Consider data sources, processing latency, and scalability.
+ many more questions, signals, and worked examples
Sign up to unlock the full Float grading rubric
Float 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
What interests you about working at Float, specifically within the fintech space, and how do you see your skills contributing to our mission of simplifying business finances?
2
Coding Screen
3- 2
Type · algorithmic
Given a list of financial transactions, each with a timestamp and an amount, write a function to calculate the running balance for each transaction. Consider edge cases like empty lists or transactions with identical timestamps. - 3
Type · algorithmic
Implement a function that takes a list of user IDs and their associated spending limits, and returns a list of users who have exceeded their spending limit. Assume spending data is available in a separate structure. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · architecture
Design a system to detect and flag potentially fraudulent transactions in real-time for Float's users. Consider data sources, processing latency, and scalability. - 5
Type · architecture
Design a notification service for Float that can send timely alerts to users about important account activities (e.g., large transactions, low balance, payment due dates). How would you ensure reliability and handle different notification channels (email, SMS, push)? - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · algorithmic
Implement a function to find the k-th largest transaction amount within a given date range. Optimize for performance, especially when k is small relative to the total number of transactions. - 7
Type · algorithmic
Given a stream of financial transactions, design and implement a data structure that can efficiently answer queries about the total spending within any given time window (e.g., last hour, last day). - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
4- 8
Type · collaboration
Tell me about a time you had a significant disagreement with an engineer or designer about a product decision. How did you approach the situation, and what was the outcome? - 9
Type · conflict-resolution
Tell me about a time you had a significant technical disagreement with a colleague or team lead. How did you approach the situation, what was the outcome, and what did you learn? - + 2 more questions in this round (sign up to unlock)
Unlock all 14 Float 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 Float
How Float's DNA translates across functions. Pick your role.
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Practice Float interviews end-to-end
Float Mock Interview
Run a live mock interview with our AI interviewer using Float-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Float Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Float interviewers grade on. Reuse them across every behavioral round.
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Float Interview Prep Hub
The frameworks behind every Float 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 Float 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 Float interview questions shows.
Implement a function that takes a list of user IDs and their associated spending limits, and returns a list of users who have exceeded their spending limit. Assume spending data is available in a separate structure.
A strong answer shows: Efficiently retrieves and compares spending data against limits.; Handles users with no spending data correctly.; Clear logic for identifying users who exceeded their limits..
What interests you about working at Float, specifically within the fintech space, and how do you see your skills contributing to our mission of simplifying business finances?
A strong answer shows: Demonstrates understanding of Float's value proposition.; Articulates specific skills and how they apply to fintech challenges.; Shows enthusiasm for the industry and the company..
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