databricks lakehouse is the architecture every modern data-engineering interview now anchors on: one copy of data on cheap object storage, a transactional delta lake layer on top, multi-engine compute (Photon SQL, Spark batch, Structured Streaming, ML notebooks) underneath one unity catalog governance plane — and the medallion architecture (Bronze raw → Silver cleansed → Gold business) is the canonical layering pattern that organises every table inside it. Together those two ideas — lakehouse architecture + bronze silver gold — are the single most-asked combination in 2026 Databricks loops, and the curriculum this guide walks through, end to end, in five numbered teaching sections.…