One hundred real Databricks data engineering interview questions across seven modules: introduction and behavioral, domain project blueprints, Spark internals, PySpark and Spark SQL, Delta Lake, Unity Catalog and Lakeflow, and production debugging. Every question includes what the interviewer is testing, the answer you can say out loud, the senior system insight, and code that runs in Databricks Free Edition. The first 15 questions are free; the full guide and printable cheat sheet are included with the book.