Capital One Analytics & Experimentation Interview Questions
Practice 301 real interview questions from Capital One. Covers Analytics & Experimentation, Behavioral & Leadership, Statistics & Math, Coding & Algorithms. For roles including Data Scientist, Software Engineer, Machine Learning Engineer, Product Manager.
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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 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...
Review Preprocessing Code and Tests
You are reviewing a small Python preprocessing codebase during an interview. You do not need to write code. Part A: Environment and execution A shell ...
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...
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., "...
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...
Diagnose Flight Delays and Burger Launch
You are given two analytics case questions. Part A: Flight delay analysis An airline wants to understand and predict delays. You receive a flight-leve...
Build House Price Model Responsibly
You are asked two machine-learning questions. Part A: House-price prediction Using a cleaned housing dataset with target sale_price, describe an end-t...
Clean and Merge Housing Data
You are given two pandas DataFrames from a house-price screening exercise. house_sales_raw - listing_id INT - sale_price FLOAT, nullable in rows reser...
Should a Restaurant Partner with Groupon?
A restaurant is deciding whether to partner with a daily-deals platform such as Groupon. Assume the restaurant's current business is: - 20 tables serv...
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...
Compute Optimal Die Re-roll Strategy
A fair six-sided die pays its face value in dollars. You may roll up to three times total. - After the first or second roll, you may either keep the o...
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...
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...
How should you renew or replace a show?
You are a data scientist at a streaming company similar to Netflix or Hulu. Your team helps decide whether existing series should be renewed or cancel...
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...
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...
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: -...
How would you design delay and watchlist models?
You may be asked one or both of the following machine-learning case questions: 1. Flight-delay prediction case An airline wants a model that predicts ...
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...