Vanguard cut legacy code research from 7 days to 15 minutes by exposing mainframe via MCP
AI Engineer · youtube · 2026-10-21
Gareth Yoder, who leads the cash program at Vanguard, shared how his team modernized a cash ledger handling up to 30 million calls a day. The turning point: exposing the legacy mainframe codebase to AI tools through an MCP server, cutting research that took a mainframe engineer 7 days down to 15 minutes.
The team ran data, producer, and consumer migrations in parallel and onboarded 50 consumers. Five takeaways: make legacy code AI-queryable, treat migration docs as product, reimagine instead of lift-and-shift, adopt AI incrementally, and never skip observability.
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