Capital One Interview Questions
Practice the exact questions companies are asking right now.
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...
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...
Return all root-to-leaf tree paths
Given the root of a binary tree, return all root-to-leaf paths. - A leaf is a node with no children. - A path should be represented as a string with n...
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: -...
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...
Decide whether to invest in R&D
Should we invest now in a Vegan burger? Build a decision narrative Context Assume you are the owner of a 100‑location fast‑casual burger chain evaluat...
Describe resolving ambiguity under pressure
Tell me about a time you were given an ambiguous, calculation-heavy case and the interviewer or stakeholder kept pushing you to 'not go too far.' Desc...
Decide whether to partner with Groupon
Decision: Partner with Groupon (Restaurant Unit Economics) Context You are the restaurant owner evaluating a Groupon partnership. The offer structure ...
Quantify and optimize team-match funnel
Team-Matching Funnel: Metrics, Targets, and a 14-Day Experiment Plan Context You are designing analytics for a recruiting "team-matching" funnel that ...
Identify and mitigate risks to break-even
Break-even Risk Assessment for the RH Partnership Offer Context You are evaluating a break-even (BE) analysis for a partnership offer with RH (e.g., a...
Address face recognition concerns with stakeholders
Case Prompt: Face Recognition for Cardholder Verification at POS You are interviewing for a Data Scientist role and are asked to evaluate a proposal t...
Debug and test a Python function in venv
Consider the Python snippet below. """ import math def accumulate(nums, start=0, cache={}): total = start for n in nums: if n % 2 == 0: nums.appen...
Assess launching a vegan burger
New Vegan Burger: Analyses, Test Plan, and Risks Context You are a data scientist at a quick-service restaurant evaluating whether to add a vegan burg...
Calculate Profitability and Evaluate Partnership for Credit Card Portfolio
Credit-Card Portfolio Profitability and Partnership Evaluation Context You are analyzing a mature credit-card portfolio to assess its current profitab...
Why Retain Phone Channel Despite Lower Profitability?
Scenario A consumer-facing, regulated company is evaluating whether to continue offering a live phone support channel that shows the lowest unit profi...
Calculate Profit and Analyze Vegan Burger Market Trends
Case Study: Should We Launch a Vegan Burger? Context (assumed for calculation) To make the task self‑contained, assume the current and proposed unit e...
Rotate matrix and find max lamp coverage
1) Square-matrix rotation with extra space: Given an n x n integer matrix, return a new matrix that is the 90-degree clockwise rotation of the input. ...
Evaluate Groupon's Impact on Restaurant's Profitability and Strategy
Restaurant Groupon Deal — Profitability Analysis Context You are advising a restaurant on whether to run a Groupon-style promotion. A typical voucher ...
Evaluate Coupon Impact on Restaurant Profitability
Profitability Assessment for a Restaurant-Coupon Partnership Context You own a restaurant and are evaluating whether to partner with a coupon marketpl...
Optimize invites under capacity constraints
You have n donors (n up to 100,000). For each donor i you know: p_online[i] (probability of donating if emailed), a_online[i] (expected donation condi...