A real-shaped payments ETL matches the section's worked example

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 real-shaped payments ETL matches the section's worked example. It pulls Stripe payments using NOW() minus a day, joins customer state from Postgres, and row-by-row INSERTs into plain Snowflake. Three idempotency bugs hide in 24 lines (wall-clock window, append-only writes, no partition column). Apply the section's refactor checklist so the pipeline passes both the two-run test and the backfill test.

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