Technical proficiency
Check hands-on depth with data quality tooling: dbt tests, Great Expectations, Soda, Monte Carlo or Anomalo, plus SQL window functions, Airflow DAGs and warehouse internals in Snowflake or BigQuery.
Evidence to listen for
- Command of the languages, frameworks, and data tools the role actually uses
- Understands correctness, performance, and failure modes, not just syntax
- Has opinions on testing and can justify them
- Reads and reasons about code they did not write
Five-point scoring guide
Cannot work independently; fundamentals are missing.
Weak fundamentals; output needs heavy review.
Competent for the role; needs guidance on complex or unfamiliar work.
Strong practitioner; handles hard problems with little guidance.
Names specific test suites and freshness checks they authored, explains threshold logic, and shows fluency in warehouse cost and query tuning.