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      Question

      What is the primary function of a 'Data Engineer' in a

      data team?
      A To build machine learning models for business prediction Correct Answer Incorrect Answer
      B To design, build, and maintain data pipelines, data warehouses, and data infrastructure Correct Answer Incorrect Answer
      C To create visual dashboards for business stakeholders Correct Answer Incorrect Answer
      D To perform statistical analysis on business datasets Correct Answer Incorrect Answer
      E To manage cybersecurity for data storage systems Correct Answer Incorrect Answer

      Solution

      Data Engineers are the plumbers of the data world. They build ETL (Extract, Transform, Load) pipelines, data lakes, and data warehouses using tools like Apache Spark, Kafka, Airflow, dbt, and cloud services (AWS Glue, Azure Data Factory). They ensure data flows reliably from source systems (core banking, ATM transactions, mobile banking) to storage and analytical systems. Without data engineers, data scientists would spend 80% of their time on data preparation rather than modelling.

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