Case Study
The Partner is a leading global investment banking and capital markets firm, providing a full range of advisory, equity, debt, and asset management services to clients worldwide. Its technology teams drive innovation across complex financial systems and enterprise platforms.
The client is a major global financial services institution operating enterprise-grade transaction processing and operational workflow platforms. The client manages mission-critical applications supporting internal corporate business functions across international markets, requiring the highest standards of security, resilience, and compliance before any production deployment.
1 day
production-ready
.NET-to-Java rebuild,
end to end
100%
accuracy
on grounded AI
“CAST produced detailed, actionable output across both discovery and code generation – from mapping the full application to structured documentation ready to use as a migration backlog.”
Senior Technology Leader
CAST Imaging gives AI the architectural grounding it needs to deliver a deterministic, production-ready .NET-to-Java rebuild – closing the security and structural gaps that AI alone cannot see.
Challenge
A global financial services firm needed to rebuild a 56,000-line .NET transaction platform in Java. The team used AI alone – all 15 business functions and 13 REST endpoints were present and working.
CAST Imaging then surfaced what the AI could not see: every endpoint lacked authentication, connection pooling was missing, and thread-safety violations existed that no functional test would catch – making production deployment impossible.
Solution
The firm added CAST Imaging as a grounding layer for AI-powered code generation. CAST Imaging mapped the full application – objects, dependencies, call paths – and fed that context to the AI via CAST Imaging's MCP server.
Spring Security was applied across all 13 endpoints, connection pooling configured, and thread-safety issues resolved before any code shipped. The rebuilt application was validated against the original throughout.
Results
The firm delivered a production-ready Java Spring Boot rebuild in one day – with zero rework. Test coverage improved 2.7×, achieving full CI/CD readiness. All 10 critical security and resilience gaps identified in the AI-only output were eliminated before deployment.
The client had a deterministic, auditable architecture rather than an approximation – and a repeatable process they could apply to other applications in the portfolio.
