Bank COBOL code-to-spec modernization agent

What was done

A large retail and commercial bank used Sapient Slingshot on Google Cloud to analyze legacy COBOL programs supporting core banking services and more than 300 critical batch feeds. The system extracts business rules, generates program overviews, process flow diagrams, field mappings, and business-readable documentation, then helps produce implementation-ready backlog items. Human teams use the output to verify behavior before modernization work proceeds, preserving traceability for compliance-sensitive banking systems. Publicis Sapient reports nearly three million lines of code converted into verified specifications in eight weeks, 95% specification accuracy, a 70-85% reduction in code-to-spec effort, and per-feed analysis falling from 35 days to five days.

Stack