Capital One Interview Questions
Practice the exact questions companies are asking right now.
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Design robber detection from surveillance video
You’re a Data Scientist on a team building a computer-vision system for public-safety monitoring. Problem Design an ML system that uses fixed surveill...
Write SQL using joins and window functions
SQL Coding: Rank within Groups with Joins You are given two tables: accounts - account_id (string) - customer_id (string) - segment (string) — e.g., "...
Solve multiple algorithmic interview questions
Below are several independent coding tasks. For each task, implement a function that returns the required output. Assume: - Arrays/lists are 0-indexed...
Deep-dive XGBoost handling and overfitting
Technical / ML Deep Dive You used gradient-boosted decision trees (e.g., XGBoost/LightGBM) for a credit risk or response prediction problem. Answer th...
Design a mobile banking app backend
Scenario Design the backend system for a mobile banking app. Users can: - Sign up / log in - View balances and transaction history - Transfer money be...
Evaluate credit-limit increase profitability
Business/Analytics Case: Credit Limit Increase Strategy You are a data scientist supporting a consumer credit business. Scenario The company is consid...
Design a highly reliable account balance system
Scenario You are designing a backend service that stores and updates user account balances (like a wallet/bank ledger). The system must be highly reli...
Remove nodes with a given value
Problem You are given the head of a singly linked list and an integer target. Remove all nodes whose value equals target, and return the (possibly new...
Design a geography-aware virtual card service
Scenario You are asked to design a virtual card number product for a financial app. Users can generate virtual card numbers to pay online/in-store. Th...
How would you decide to cancel a TV show?
Case: Cancel/keep/sell a TV series You are the CEO of a streaming company. You currently produce and distribute a TV series called "Analyst". Part A —...
Answer conflict and ambiguity with STAR stories
Job Fit / Behavioral: STAR Stories Prepare answers using the STAR (Situation, Task, Action, Result) format for the following prompts: 1. Tell me about...
Explain production model drop to a PM
Role Play: Communicate Model Degradation to a Non-Technical PM You are a data scientist. A PM says: > “Your model performed great on the validation se...
Solve OA tasks on string, grid path, subarrays
You are given three independent coding tasks. Task 1: Reverse the middle if ends are vowels Given a string s (ASCII letters), if both the first and la...
Design a cross-region event processing platform
Scenario Design a cross-region event processing platform that ingests events from producers, stores them durably, and delivers them to multiple consum...
How would you improve card-type detection?
Scenario You have a service that needs to determine a credit/debit card network/type (e.g., Visa, Mastercard, AmEx, Discover, etc.) from the card numb...
Support updates and count target-sum pairs
You are given two integer arrays: - A (fixed / primary) - B (modifiable / secondary) You must process a sequence of operations of two types: 1. Update...
Decide on vegan-burger R&D investment
Investment Decision: Vegan Burger R&D and Launch Business Case You are evaluating whether to invest now in R&D to develop and launch a plant-based (ve...
Implement deposit, withdraw, and transfer in a class
Problem Implement a class AccountService that supports basic money operations on accounts. Operations - deposit(accountId, amount) - withdraw(accountI...
Validate virtual credit card transactions from encoded IDs
You are designing logic for a virtual credit card product. Part 1: Product reasoning Explain key benefits and drawbacks of virtual credit cards for: -...
Answer motivation and teamwork questions
You are in a behavioral interview for an entry-level software role. Answer the following prompts: 1. Why did you choose to study Computer Science? 2. ...