A dbt project's CI rebuilds every model on every PR

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 dbt project's CI rebuilds every model on every PR. Engineers stopped running CI locally because it takes 45 minutes; they push and watch it fail in GitHub. The section names four CI test layers (code, logic, schema/contracts, integration) and the slim-CI optimization: build only the models that changed plus their downstream descendants, against a deferred dev warehouse, with teardown after the PR closes. Design the test plan by replacing the CI step with a slim-CI runner whose name states the four test layers, the changed-models-plus-descendants selector, the deferred dev warehouse, and the teardown.

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