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Capital One Software Engineer Interview Questions

The questions to prepare for a Capital One Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
System DesignStart here. 18 questions · ~144 min
Design Real-Time Fraud Risk ScoringHard
Recently asked

Design a real-time fraud scoring system for card transactions with strict latency, delayed labels, and high availability requirements.

Feature StoreFeature DriftModel ServingCapital One
Securing Credit Card DataMedium
Recently asked

Evaluates security design for sensitive payment data and access control mechanisms.

data securityauthenticationencryptionCapital One
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2
Coding18 questions · ~144 min
Matrix Integer ProblemMedium

Tests ability to reason about 2D data structures and implement correct algorithms.

MatrixCapital One
General LeetCode PracticeMedium

Assesses overall coding readiness across common interview problem types.

leetcodeCapital One
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3
Security & Infrastructure3 questions · ~24 min
Concurrency and Data ConsistencyMedium

Assesses understanding of correctness, consistency models, and concurrency tradeoffs.

data consistencyCapital One
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4
Pipelines3 questions · ~24 min
Chatbot Case Study With EventsHard

Evaluates your approach to event-driven data processing and time-based reasoning.

data processingCapital One
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5
Behavioral & Leadership5 questions · ~40 min
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6
More topics3 questions · ~24 min
Top N Active Accounts SQLMedium

Evaluates SQL/data manipulation skills for ranking and aggregation over transactions.

Data AnalysisCapital One
Why You Applied to DowEasy

Tests your motivation and fit for the QA Engineer role at Dow.

User NeedsValue PropositionProduct VisionCapital One
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Analyze Customer Purchase Trends with Window FunctionsMedium
Practice
Recently asked
Practice drill

Calculate the monthly spending trends for customers using window functions and joins.

The Home DepotHewlett Packard EnterpriseConvoy
Top 5% Customers by ChannelHard
Practice
Practice drill

Use CTEs and percentile-style ranking to find the top 5% of customers by 30-day transaction volume within each marketing channel.

Window FunctionsDate FunctionsRankingCapital OneDaveCredit Saison India
Top Users by Recent Transaction VolumeMedium
Practice
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlCurrent (NY)RevolutTTier 1 Bank
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.