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Delta Lake Explained: Reliable Lakes with ACID
Delta Lake explained with a working table built from real taxi data: what the transaction log is, how each write becomes an atomic version, schema enforcement rejecting a bad append, delete and merge, a merge that quietly re-inserted deleted rows, time travel between versions, and maintenance.
Data Contracts: Reliable Pipelines Between Teams
What a data contract is and how to use one: the schema, quality rules, ownership and service levels it records, a small contract written for a real taxi dataset and checked against the 2022, 2024 and 2025 files, where two versions break it for different reasons, where to enforce contracts, and how to start.