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ETL and data pipelines · Advanced · 5 h

Incremental and idempotent loads

Load only what changed, handle late data, and make every run safe to repeat.

Why employers care: Full reloads stop scaling quickly. Idempotency and backfills are standard senior data engineering interview topics.

In the roadmaps for: Data Engineer

Lessons, in order

  1. Incremental loads, late data and backfillsLoad only new data with a watermark, merge updates safely, and backfill a year without breaking anything.3 min