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# Hergy Fongue
Lead developer at Finanz Informatik modernizing legacy COBOL banking mainframes.

## About

Hergy Fongue builds cloud-native core components at Finanz Informatik. As a lead developer, he modernizes the central data warehouse for the German Sparkasse Finance Group, migrating it from monolithic mainframes to a decentralized architecture.

His work focuses on transitioning decades-old COBOL systems into modular Java services without disrupting daily banking operations for 50 million customers. Hergy explores practical ways to reverse-engineer legacy code, simplify data processing flows, and boost developer productivity.



## Past Sessions

### World Congress 2026 Europe · July 8, 2026
Berlin, Germany
- [From COBOL to Java: How Developers Transition 60 Years of Legacy into Modern Java Services](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/943-from-cobol-to-java) · 120 min

### World Congress 2025 · July 9, 2025
Berlin, Germany
- [ From Mainframe to Modular: The Developer’s Guide to Legacy Modernization](https://www.wearedevelopers.com/events/world-congress-2025/sessions/658-from-mainframe-to) · 120 min