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Updated weekly · Last refresh Oct 10

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 daily.

50questions
~11htotal time
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1
CodingStart here. 17 questions · ~234 min
Max Value Index From LogsEasy
Practice

Scan audiobook listening times once and return the first index containing the maximum value.

ArraysArray ManipulationAlgorithmsCapital One
Walkthrough Code: Clicks and TransactionsMedium
Practice

Trace a Python event-processing loop and aggregate each user's clicks and transactions.

aggregationcode analysisArraysCapital One
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2
Execution5 questions · ~69 min
Explain Testing RationaleHard

Explain testing strategy, calculate testing cost against a budget, recommend an approach, and debug a code snippet.

automated testingExecutionbudget controlCapital One
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3
System Design17 questions · ~234 min
Credit Card Application Site DesignHard

Design a secure credit card application site covering authentication, account creation, application submission, and ML-assisted risk controls.

data securityauthorizationml inferenceCapital One
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4
Security & Infrastructure3 questions · ~41 min
Concurrency and Data ConsistencyMedium
Recently asked

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

data consistencyCapital One
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5
Behavioral & Leadership5 questions · ~69 min
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6
More topics3 questions · ~41 min
Top N Active Accounts SQLMedium
Recently asked

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

Data AnalysisCapital One
Warehouse Package AllocationHard
Recently asked

Evaluates your ability to design algorithms for constrained logistics and state changes over time.

Capital One
Choose Go vs PythonMedium
Recently asked

Assesses your engineering judgment and tradeoff reasoning for language selection.

Capital One
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Rolling Window Customer TransactionsMedium
Practice
Recently asked
Practice drill

Aggregate posted transactions by customer and date, then calculate each customer's rolling 30-day transaction total.

aggregationDate FunctionsData ManipulationJJPMorganCapital OneXometry
SQL Fraud Detection: Two CitiesMedium
Practice
Recently asked
Practice drill

Use a self-join and time interval filtering to identify Capital One accounts transacting in different cities within one hour.

Window FunctionsDate FunctionstransactionsCapital One
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Recently asked
Practice drill

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

The Home DepotAvisoHewlett Packard Enterprise
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.