An ageing proprietary application is replaced by a modern equivalent that runs beside it on the same live data until the buyer is ready to switch. The migrator is re-runnable in full or delta mode with per-table watermarks, moves attached files and photos as well as rows, reconciles deletions, and prints a validation report that fails the run on any mismatch, so cutover is a decision rather than a leap.
What ports as-is
- The migrator pattern (full wipe-and-reload, delta upsert with a watermark table, child-first delete reconciliation, file and blob migration, validation report, non-zero exit on mismatch)
- Containerization of the legacy application and its database so the old system keeps serving from new infrastructure
- Side-by-side slot routing with a traced hostname-to-datasource table
- A screen-by-screen parity inventory as the promotion checklist
What we build for you
- The legacy schema mapping
- The source connection and file layout
- Which tables are watermarked
- The parity inventory against the old screens
- The write-window reconciliation plan for the switchover
