Type · algorithmic
Given a stream of stock trades, each with a timestamp and price, design an algorithm to efficiently calculate the N-minute moving average price for any given time.
Growth · Software Engineer Interview Guide
Headquartered in United KingdomInterview language: English
How to Pass the Capital.com Software Engineer Interview in 2026
The Capital.com DNA (TL;DR)
Capital.com's 'Online Trading' platform serves as a key reference point; interviewers assess how candidates would innovate within its constraints. They seek individuals who can clearly articulate financial concepts and apply a nuanced approach to risk, reflecting principles found in their 'Risk Disclosure Statement Log'.
The Capital.com 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 Capital.com interview outcomes, avoid these common traps:
- Ignoring the specific constraints of high-frequency financial systems
- Failing to address reliability and fault tolerance of the notification delivery.
- Using a data structure that doesn't allow for efficient addition and removal of elements.
- Not handling the initial state or edge cases like zero transactions.
Test Yourself: Real Capital.com Questions
Three real prompts pulled from our database.
Type · debugging
Here is a snippet of code that's supposed to calculate the profit/loss for a given trade. It's producing incorrect results for some edge cases. Debug and fix it.
Type · architecture
How would you design a system to detect and prevent fraudulent trading activities on Capital.com's platform in real-time?
+ many more questions, signals, and worked examples
Sign up to unlock the full Capital.com grading rubric
Capital.com 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
What interests you about working at Capital.com, specifically within the fintech industry and our engineering team?
2
Coding Screen
3- 2
Type · algorithmic
Given a stream of stock trades, each with a timestamp and price, design an algorithm to efficiently calculate the N-minute moving average price for any given time. - 3
Type · algorithmic
Implement a function that takes a list of financial transactions (each with an amount and a timestamp) and returns the total balance after each transaction, considering a daily fee if the balance drops below a certain threshold. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · architecture
Design a real-time stock price notification system for Capital.com users. Users should be able to set price alerts for specific stocks, and receive notifications when those prices are met or crossed. - 5
Type · architecture
How would you design a system to detect and prevent fraudulent trading activities on Capital.com's platform in real-time? - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · algorithmic
You are given a list of historical price data for a stock, represented as pairs of (timestamp, price). Implement a function to find the maximum profit that could have been made by buying and selling the stock once. Assume you must buy before you sell. - 7
Type · code-quality
Refactor this existing Python code for calculating currency exchange rates to improve its readability, maintainability, and performance. Consider potential issues with floating-point precision and error handling. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 8
Type · ownership
Tell me about a time you encountered a significant technical challenge or bug in a production system that was impacting users. What steps did you take to diagnose, resolve, and prevent recurrence? - 9
Type · collaboration
At Capital.com, we often balance the trade-off between ultra-low latency execution and strict regulatory compliance requirements. Describe a time you had to advocate for a specific architectural trade-off that prioritized platform stability or risk mitigation over feature velocity. How did you align your engineering team with the long-term risk profile of the trading system? - + 1 more questions in this round (sign up to unlock)
Unlock all 13 Capital.com 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 Capital.com
How Capital.com's DNA translates across functions. Pick your role.
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Practice Capital.com interviews end-to-end
Capital.com Mock Interview
Run a live mock interview with our AI interviewer using Capital.com-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Capital.com Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Capital.com interviewers grade on. Reuse them across every behavioral round.
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Capital.com Interview Prep Hub
The frameworks behind every Capital.com 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 Capital.com 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 Capital.com interview questions shows.
Given a stream of stock trades, each with a timestamp and price, design an algorithm to efficiently calculate the N-minute moving average price for any given time.
A strong answer shows: Proposes an efficient solution with low time complexity for queries.; Discusses trade-offs between space and time complexity.; Handles edge cases and potential data issues..
Here is a snippet of code that's supposed to calculate the profit/loss for a given trade. It's producing incorrect results for some edge cases. Debug and fix it.
A strong answer shows: Systematically identifies the bug and explains its cause.; Provides a correct and robust fix.; Demonstrates understanding of potential pitfalls in financial calculations (e.g., floating-point arithmetic)..
Frequently asked questions
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