Structure by category with depth. Processing: Python, PySpark, Scala; SQL (BigQuery, Snowflake, PostgreSQL). Orchestration: Airflow, Prefect, Dagster. Cloud: AWS (S3, Glue, Lambda, EMR), GCP (BigQuery, Dataflow). Storage: Parquet, Delta Lake, Iceberg. Streaming: Kafka, Kinesis. MLOps: MLflow, Feature Store. WHY: Demonstrate breadth and alignment with role. Differentiate: 'I've led migrations to dbt' vs....
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