Dataflow ETL Pipeline

Google Cloud Dataflow is Google's managed service for running Apache Beam pipelines at scale. Beam is a unified framework for batch and streaming data processing. Engineers write Python (or Java/Go) transformations once; Beam/Dataflow executes them on distributed infrastructure with auto-scaling, fault tolerance, and monitoring. Example: Events stream from Pub/Sub → Filter invalid events → Enrich with user data → Aggregate per minute (window) → Write to BigQuery. Dataflow scales from 1 event/sec to 1M events/sec automatically.