Guides stay short on purpose. Deployment, Docker, and pilot grids live on shared pages — not here.
Why teams move now
- Talent cliff. The people who wrote the batch are retiring.
- MIPS / ops cost. Batch data work is cheaper on a lakehouse / warehouse.
- Copybook fear. REDEFINES and ODO block manual rewrites — automation is the path.
Hardest construct — sanitized peek
Enough to judge fit. Not a rebuild-the-parser cookbook.
Before 05 AMT-X PIC X(12). 05 AMT-N REDEFINES AMT-X PIC S9(10)V99. After (BigQuery) -- Typed fields → BigQuery SQL (conceptual)
SQL vs Python
BigQuery SQL when SQL is enough. When you need Python, we emit PySpark on Dataproc that writes to BigQuery.
What good looks like
Parser-driven conversion, readable BigQuery output, and row-level parity before cutover. Upload a sample or run a pilot — no email gate to peek.