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Growth · Software Engineer Interview Guide

Interview language: English

How to Pass the Cleo Software Engineer Interview in 2026

The Cleo DNA (TL;DR)

Cleo's 'Be Brave' value is tested by evaluating how candidates approach ambiguous financial problems, especially when discussing the trade-offs of features like the Cleo Plus subscription or the Credit Builder. Interviewers look for clear articulation of impact and a willingness to challenge assumptions.

The Cleo Interview Loop

Your onsite loop will typically consist of 5 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Cleo interview outcomes, avoid these common traps:

Blaming the other party or portraying them negatively.
Ignoring the need for webhooks or polling mechanisms to notify the client of status changes.
Describing an unresolved conflict or negative outcome.
Choosing a trivial problem or one that was already assigned.

Test Yourself: Real Cleo Questions

Three real prompts pulled from our database.

Type · String Manipulation

Cleo often deals with parsing unstructured text from bank statements or user inputs. Write a function to extract all monetary values (e.g., '$10.50', '£25', '5.00 EUR') from a given string and return them as a list of numerical values (floats). Handle different currency symbols and formats.

Type · Scalability

Cleo's user base is growing rapidly. How would you design a system to process millions of incoming transaction notifications daily, ensuring low latency and high availability? Discuss potential bottlenecks and how to mitigate them.

Type · Data Structures

Given a list of user transactions, each with a timestamp, amount, and category, write a function to calculate the total spending for each category within a given date range. Optimize for performance.

+ many more questions, signals, and worked examples

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Cleo Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 20 questions shown

Recruiter Screen

1
Type · Motivation
What interests you about working at Cleo, specifically within the fintech space, and how do you see your skills contributing to our mission of helping young people manage their money better?

Coding Screen

2
Type · Data Structures
Given a list of user transactions, each with a timestamp, amount, and category, write a function to calculate the total spending for each category within a given date range. Optimize for performance.
3
Type · Algorithmic Thinking
Imagine Cleo wants to implement a feature that suggests budget adjustments based on spending patterns. Design an algorithm to identify users whose spending in a particular category (e.g., 'dining out') has increased by more than 30% month-over-month, considering only users with at least 5 transactions in that category for both months. Explain the time and space complexity.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · API Design
Design an API endpoint for Cleo that allows users to securely link their bank accounts. Consider authentication, data privacy, potential failure points, and how to handle asynchronous bank linking processes.
5
Type · Scalability
Cleo's user base is growing rapidly. How would you design a system to process millions of incoming transaction notifications daily, ensuring low latency and high availability? Discuss potential bottlenecks and how to mitigate them.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · Debugging
Here is a Python function that's supposed to calculate a user's 'safe-to-spend' amount based on their income, upcoming bills, and recent spending trends. It's producing incorrect results for some edge cases. Debug this code and explain your thought process.
7
Type · Algorithmic Problem
Implement a function that takes a list of Cleo users, each with a list of transactions, and returns the top 3 users with the highest average transaction value. Handle cases where users have fewer than N transactions (where N is a configurable minimum, e.g., 5). Ensure the solution is efficient for a large number of users and transactions.
+ 1 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · Conflict Resolution
Tell me about a time you had a significant disagreement with a cross-functional team member (e.g., engineer, designer, marketer). How did you approach it, and what was the outcome?
9
Type · Ownership
Tell me about a time you took ownership of a problem or project that wasn't strictly in your job description. What was the situation, and what did you do?
+ 8 more questions in this round (sign up to unlock)

Unlock all 20 Cleo questions, free

No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.

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Interview tracks at Cleo

How Cleo's DNA translates across functions. Pick your role.

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Practice Cleo interviews end-to-end

Cleo Mock Interview

Run a live mock interview with our AI interviewer using Cleo-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.

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STAR Stories for Cleo Behavioral Rounds

Build a Story Bank of your past wins, mapped to the leadership signals Cleo interviewers grade on. Reuse them across every behavioral round.

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Cleo Interview Prep Hub

The frameworks behind every Cleo 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 Cleo 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 Cleo interview questions shows.

A strong answer shows: Proficiency with regular expressions.; Attention to detail in handling various formats.; Robust error handling for parsing.; Understanding of numerical data types..

A strong answer shows: Knowledge of distributed systems concepts.; Experience with message queues.; Understanding of database scaling techniques.; Awareness of caching and asynchronous processing.; Focus on high availability and fault tolerance..

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