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Updated weekly · Last refresh Oct 17

Safran Data Engineer Interview Questions

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

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1
PipelinesStart here. 3 questions · ~24 min
Spark Caching Memory LimitsMedium

Assesses your understanding of Spark executor memory and caching behavior for data pipelines.

memory managementsparkSafran
Window Functions at ScaleHard

Tests skills in writing efficient window operations and controlling performance at scale.

Window FunctionsSafran
PySpark Aggregation and Partition TuningMedium

Assesses strategies for optimizing aggregations and partitioning to improve Spark performance.

pysparkSafran
2
More topics2 questions · ~16 min
CSV Ingestion and TransformationsMedium

Tests your ability to perform SQL-style transformations and analytics on ingested data.

transformationsSafran
Spark Memory ManagementMedium

Tests understanding of Spark executor memory management and allocation behavior.

memory managementdata processingsparkSafran

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
7-Day Rolling User Average in SQLMedium
Practice
Practice drill

Calculate each user's seven-day rolling average of daily events using PostgreSQL window functions.

Window FunctionsDate FunctionsData ManipulationBounteousFFreelancerBBoston Tech India
Advanced SQL TopicsHard
Practice
Practice drill

Use joins, aggregation, CTEs, ranking, and CASE logic to summarize customer sales by region.

JoinsCTEsData StructuresWalmart Global Tech
Spark Query Optimization InternalsHard
Practice
Practice drill

Explain Spark query optimization techniques and demonstrate an optimized analytical query over job and stage metrics.

database optimizationlarge datasetsquery optimizationNVIDIA
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