A 5-year-old fintech hand-rolled every layer: custom Python extracts, a custom S3 layout, Postgres-a

A medium Pipeline Design interview practice problem on DataDriven. Write and execute real pipeline design code with instant grading.

Domain

Pipeline Design

Difficulty

medium

Problem

A 5-year-old fintech hand-rolled every layer: custom Python extracts, a custom S3 layout, Postgres-as-warehouse, a cron-script 'orchestrator', an in-house catalog, and Slack-script 'observability'. One full-time engineer maintains each layer, and the proprietary attribution model is mixed into the same custom mess. Apply the section's build-vs-buy rule: keep custom only for the differentiated business logic, replace every commodity layer with a managed vendor.

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