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  •  ...explode, structs),`mapInPandas` / pandas UDFs, window functions for velocity and distinct-count aggregates, partitioning and performance tuning Databricks: Unity Catalog (catalogs, schemas, grants, column masks, tags, lineage), external locations on S3, cluster / compute... 
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  •  ...data engineering. ~ Deep experience with Apache Spark/PySpark at scale , including partitioning, performance optimization, memory tuning, and distributed processing. ~ Experience with modern lakehouse technologies such as Databricks and Delta Lake , or comparable... 
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