Medallion Architecture
Imagine a startup in its early stages, relying on a few custom Python ETL pipelines to move and process data. At this point, the system works and the data is manageable, and the pipelines are relatively simple to maintain.
However, as the business grows, data begins to flow in from multiple sources -- applications, third-party tools, and customer interactions. What once worked efficiently starts to become increasingly difficult to manage.
The growing complexity places strain on these custom pipelines. Maintenance becomes time consuming, changes introduce unexpected failures, and the system gradually becomes fragile.
Over time, pipelines begin to break, leading to inconsistent data across teams. Different departments start working with conflicting numbers, trust in data declines, and the overall system becomes difficult to scale or sustain.
At this point many organization shift to Medallion Architecture.
What is Medallion Architecture ?
The Medallion Data Architecture is a design pattern and data management pattern used to logically organize data for different use cases.
Medallion Data Architecture has 3 layers:
- Bronze
- Silver
- Gold
Bronze Layer
It is a layer where all the raw data lands from different sources.
Silver Layer
Silver layer has refined data from the bronze layer. All transformation and standardized happens in this layer
Gold Layer
This layer has highly curated, project-specific data ready for business consumption which is brought from silver layer.
Medallion Architecture Example
Bronze Layer (Raw Data)
| order_id | customer_name | product | amount | timestamp |
|---|---|---|---|---|
| 1 | John Doe | Protein Bar | 10.5 | 2026-03-18 10:00:00 |
| 2 | john doe | protein bar | 10.5 | 2026-03-18 10:01:00 |
| 3 | Mary Jane | Energy Drink | null | 2026-03-18 10:05:00 |
Silver Layer (Cleaned & Standardized)
| order_id | customer_name | product | amount | timestamp |
|---|---|---|---|---|
| 1 | John Doe | Protein Bar | 10.5 | 2026-03-18 10:00:00 |
| 2 | John Doe | Protein Bar | 10.5 | 2026-03-18 10:01:00 |
| 3 | Mary Jane | Energy Drink | 0.0 | 2026-03-18 10:05:00 |
Gold Layer (Business-Level Aggregation)
| product | total_sales | total_orders |
|---|---|---|
| Protein Bar | 21.0 | 2 |
| Energy Drink | 0.0 | 1 |
Why do organization prefer to use Medallion Architecture ?
1. Improves data quality
• Bronze keeps raw, unmodified data (source of truth)
• Silver cleans, validates, and standardizes
• Gold delivers trusted, business-ready data
2. Reduces complexities in data
• Data flows in clear stages
• Each layer has a single responsibility
3. Supports Multiple Use Cases from Same Data
Same data can serve:
• Data scientists → Silver layer
• Analysts → Gold layer
• Engineers → Bronze layer
4. Aligns Data with Business Value
• Bronze = raw data
• Silver = usable data
• Gold = decision-making data
Final Thought
Medallion Architecture is not just about organizing data—it is about enabling organizations to move with clarity, make decisions with confidence, and scale without losing control of their most critical asset: data.