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1.5.1. Layer Responsibilities
| Layer | Data State | Transformations | Access Pattern |
|---|---|---|---|
| Bronze | Raw, exact copy of source | Minimal (add metadata) | Data engineers only |
| Silver | Cleaned, validated | Type casting, deduplication, null handling | Data engineers, advanced analysts |
| Gold | Business-ready | Aggregations, joins, business rules | All consumers |
A staging area is not a medallion layer: it holds transient working data that is discarded once processing finishes, whereas Bronze keeps the raw history permanently.
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Written byAlvin Varughese
Founder•20 professional certifications