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Updated weekly · Last refresh Oct 17

Capital One Data Engineer Interview Questions

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

33questions
~5htotal time
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1
SQL & Data ManipulationStart here. 8 questions · ~80 min
Download, Clean, and Transform Data with PandasMedium
Practice

Clean API transaction records by validating fields, removing duplicates, and matching customer reference data.

data cleaningdata validationdata extractionCapital One
SQL Data ManipulationMedium
Practice
Recently asked

Describe complex SQL data manipulation and explain how you validated correctness and improved query performance.

database optimizationdata accuracyData ManipulationCapital One
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2
System Design4 questions · ~40 min
Data Architecture for a Chatbot BackendHard

Design the data, backend architecture, resiliency, and privacy controls for a hypothetical chatbot.

backend integrationdata securityfailure modesCapital One
Chatbot Service with Efficient CachingHard

Design a grounded chatbot that helps users find website features, including retrieval, ranking, caching, and fallback behavior.

latencyfactual groundingagent designCapital One
System Design for Data Ingestion with Trade-offsHard

Design an ingestion and ML serving architecture, including OLAP, OLTP, tradeoffs, and multi-region failover.

distributed systemsdata ingestionarchitecture patternsCapital One
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3
Pipelines11 questions · ~110 min
Designing AWS and Snowflake PipelinesHard
Recently asked

Explain how to design reliable AWS and Snowflake pipelines, including ingestion, transformation, orchestration, quality, and operational trade-offs.

data pipelinesETLdata warehouseCapital One
Disaster Recovery and Fault ToleranceHard
Recently asked

Explain how to design disaster recovery and fault tolerance for cloud-native data platforms.

Infrastructuredata pipelinesfault toleranceCapital One
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4
Behavioral & Leadership9 questions · ~90 min
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5
More topics1 question · ~10 min
Coding: Matrices and AlgorithmsMedium
Practice
Recently asked

Validate required difficulty coverage and confirm that a supplied 2D matrix is rectangular and non-empty.

leetcodeArraysMatrixCapital One
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