What does a data engineer do?
💡 Model Answer
A data engineer designs, builds, and maintains the systems that collect, store, and process data. They create ETL/ELT pipelines that move data from source systems into data warehouses or lakes, ensuring data quality, consistency, and availability. They work with SQL, Python, Spark, Hadoop, and cloud services (AWS Glue, GCP Dataflow, Azure Data Factory). They also optimize query performance, manage data schemas, implement security and compliance controls, and monitor pipeline health. In essence, data engineers provide the infrastructure that enables data scientists, analysts, and business users to access reliable, high‑quality data for decision‑making.
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