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Simon Schuster / Field notes

Built,
documented,
deployed.

Technical write-ups from production systems. Data engineering, AI agents, geospatial intelligence, security, and infrastructure.

Articles12
Topics9
Total read220 min

Articles published

12

Reading time

220m

Topics

9

Lead article
Data EngineeringFeb 11, 202622 min read

Revenue Leak Investigation: Medallion Architecture in Production

How a lakehouse on Apache Spark and Delta Lake diagnosed a EUR 2.1M payment gateway failure in 4 hours. Full technical walkthrough with PySpark, MinIO, and systematic root cause analysis.

EUR 2.1M root cause isolated in 4 hours across 750K+ events

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