The Data Foundry
Built by Data with Pranjal
All Practice
Choose a guided lab or practice track
SQL Lab
Interview SQL with real data and validation
Python Lab
Data engineering Python practice
PySpark Lab
Spark code review and production fixes
Airflow Lab
DAG incidents, retries, sensors, and backfills
AWS Lab
Service choices, architecture, security, and cost
System Design Studio
Architecture trade-offs and interview framing
The Data Foundry is improving every week. If something feels unclear, broken, or missing, tell us and we will use it to improve the platform.
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