Lab L05 · Engagement

Messy Data Mapper

• MVP set
• ≈ 50 min
• Interactive version coming

Fax server, EHR, claims system and an SFTP drop appear as buildings. Records flow as particles, and broken mappings show up as stalled or duplicated flows.

What you’ll practise

1. Mapping fields across systems that disagree about the same record
2. Finding duplicates, gaps and silent truncation before they reach the model
3. Documenting a data contract the customer’s data engineer can own

In the book