migrating-legacy-etl

Plan and execute migrations of legacy ETL and data warehouses — stored procedures, SSIS/Informatica, or on-prem warehouses to modern stacks (dbt, Spark, cloud warehouses) — using strangler-fig phasing, parallel runs, and row/aggregate reconciliation. Use when migrating legacy pipelines or warehouses, rewriting stored procedures into dbt/Spark, or validating a migration against the source system.