As demand surged across India’s public sector and rural banking landscape, a homegrown banking product company sought to migrate its core platform from Java to .NET. The reason: align with Microsoft ecosystems, enable smoother deployments across 5000+ bank branches, and tap into broader market opportunities.
With multiple modules still under active development, the migration had to accommodate in-flight code, offer a quick go-live, and pass Microsoft’s architectural validation — all within 6 months.
The existing Java application was:
- Built incrementally over years — with parts still undergoing development
- Not optimized for Microsoft compatibility
- Required to scale across 5,000+ retail bank branches
- Needed to undergo an external audit by Microsoft for certification
The biggest hurdles: high automation in code translation, agile migration to match work-in-progress code, and rapid deployment readiness.
- Parser Enhancements:
- Upgraded the parser to intelligently identify developer comments, ensuring that only executable code was migrated — avoiding unnecessary baggage.
- Upgraded the parser to intelligently identify developer comments, ensuring that only executable code was migrated — avoiding unnecessary baggage.
- Reverse Engineer Upgrade:
Improved LeMiT’s Translator capabilities to meet Microsoft’s audit-grade quality.
Reverse-engineered complex Java constructs into .NET equivalents with high automation.
- Phased Migration Plan:
UI Prototyping: Rapid conversion of interfaces to .NET UI components
Code Migration: Reused business logic intelligently with architectural enhancements
Basic Testing: Allowed teams to test even the modules still in development
- Audit-Ready Architecture:
- Designed a best-in-class .NET architecture suitable for Microsoft validation
Delivered clean, maintainable, and modular code optimized for scale
✅ UI migration to .NET
✅ Code migration (Java to .NET)
✅ Unit and basic functional testing for work-in-progress modules
❌ Acceptance testing
❌ Database modeling
❌ Data migration
Smarter Parsing
Enhanced LeMiT Miner to distinguish between logic and developer notes — a key factor in reducing cluttered migration.
High Automation
Translator had to be upgraded for deeper automation and reverse engineering capabilities to meet Microsoft certification criteria.
Parallel Development Handling
Built in flexibility for teams to continue Java development while migration proceeded in tandem — significantly reducing downtime.
Major modules went live within 6 months
Successfully passed Microsoft’s architectural audit
Delivered a robust, scalable .NET platform ready for deployment across 5000+ banking branches
Built a solid foundation for future growth, faster updates, and smoother third-party integrations
Java, .NET Framework, Visual Studio, LeMiT™, Microsoft Architecture Validation Tools
LeMiT is a proprietary legacy modernization suite from Bangalore Softsell Ltd. Project results are contextual and may vary depending on architecture, code complexity, and integration scope.
