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Banco Santander Data Engineer Interview Questions

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

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1
PipelinesStart here. 26 questions · ~208 min
Choose Kafka vs FlinkEasy

Design a streaming pipeline and justify when Kafka, Flink, or both should be used for ingestion, stateful processing, replay, and low-latency delivery.

Stream ProcessingOrchestrationDependenciesBanco Santander
Design an ETL Pipeline with Data Quality ChecksMedium

Develop an ETL pipeline to process 10TB of daily sales data with strict data quality validations and orchestration requirements.

Deep LearningBanco Santander
Fraud Detection Batch vs StreamingMedium

Design a fraud pipeline that compares batch, streaming, and hybrid architectures for 120K tx/sec with sub-300 ms decisions and reconciled hourly tables.

Stream ProcessingETLBatch ProcessingBanco Santander
Describe a Complex Transformation PipelineMedium

Explain a complex ETL transformation you built, including the main challenges and how you handled them.

ETLData ModelingQualityBanco Santander
Fault Tolerance in Data PipelinesHard

Approach for building fault tolerance into a distributed data pipeline, including retries, idempotency, and recovery controls.

InfrastructureIdempotencyQualityBanco Santander
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2
Behavioral & Leadership3 questions · ~24 min
Defend Your Data Engineering DesignMedium

Evaluates your ability to defend technical design decisions and communicate trade-offs clearly.

system designBanco Santander
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3
More topics2 questions · ~16 min
Model Data for AnalyticsMedium

Tests your ability to design analytics-ready models and transformations.

Data WranglingCTEsGroup ByBanco Santander
Optimize Slow SQL QueriesMedium

Tests your approach to diagnosing and improving SQL performance in data pipelines.

JoinsData WranglingAggregationsBanco Santander

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 31 questions plus 3 hands-on drills to finish this plan.