Global Financial Technology Solutions Provider

Migrated FIS Global's legacy financial application from deprecated .NET Framework 4.5 to modern .NET Core 7 — preserving all business logic, modernizing the UI, and enabling AI-readiness.

Company Context

One of the world's largest financial technology companies, providing mission-critical systems for banks, financial institutions, and enterprise clients. Platforms handle transaction processing, compliance workflows, and internal financial operations at global scale.

Engineering Environment

.NET Core.NET Framework 4.5Financial SystemsMigrationModernization

What Our Scale Partnership Revealed

.NET Framework 4.5 had reached end-of-support — in a regulated financial environment, running unsupported infrastructure is a compliance failure, not just technical debt.
Security vulnerabilities were accumulating with no upstream patches available.
The architecture could not be extended to support AI-driven financial automation workflows, blocking the platform's evolution roadmap.
Modernization had to preserve 100% of existing business logic — in financial systems, any workflow regression has direct compliance and operational impact.

Engineering Work

Migrated the full application from .NET Framework 4.5 to .NET Core 7 — rebuilt the architecture to current standards while maintaining exact functional parity.
Preserved all existing business workflows and logic during migration — validated against the original system behavior.
Modernized the user interface alongside the backend migration.
Architecture now supports AI integration — the compliance and analytics automation capabilities that were previously blocked can now be built.

System Outcome

Deprecated framework dependency eliminated — platform is on a supported, actively maintained stack.
Security vulnerabilities and compliance risk removed.
Business logic fully preserved — zero workflow regression across the migration.
UI modernized — improved usability for internal users.
Platform is now AI-ready for financial automation and analytics workflows.

Engineering Breakdown+

Migration Strategy: Incremental module-by-module migration rather than a big-bang rewrite. Each module was migrated, tested for behavioral equivalence against the original, then integrated — reducing regression risk at each step.

Business Logic Preservation: Built a parallel test harness that ran the same inputs through both old and new implementations and compared outputs — any divergence was caught and resolved before the module was considered migrated.

.NET Core 7 Architecture: Adopted dependency injection, middleware pipeline, and modern configuration patterns — aligning with current .NET conventions while removing the legacy coupling patterns from Framework 4.5.

Scale Partnership

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