> Markdown version of [/events/world-congress-2025/sessions/658-from-mainframe-to](https://www.wearedevelopers.com/events/world-congress-2025/sessions/658-from-mainframe-to). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

#  From Mainframe to Modular: The Developer’s Guide to Legacy Modernization


- **Date:** Thursday, Jul 10, 2025
- **Time:** 15:45–17:45 (120 min)
- **Room:** M6 (40 Seats)
- **Event:** World Congress 2025

## Description

Modernizing legacy systems is one of the toughest – and most rewarding – challenges in enterprise IT. In this session, Jannis, Lars, Hergy and Kritika share how they are transforming mission-critical legacy systems and mainframe applications to a modern state of the art banking platform for the German Sparkasse Finance Group and their 50 million customers. From COBOL to Java, from monolithic mainframes to shared services and cloud-native architectures – we explore different modernization strategies and where the mainframe still makes sense. A special focus lies on empowering developers: by automating routine tasks and improving the developer experience, we enable teams to shape the future, not just maintain the past.

## Speakers

### [Hergy Fongue](https://www.wearedevelopers.com/@hergy-fongue)

Software Engineer at Finanz Informatik
### [Jannis Eickenroth](https://www.wearedevelopers.com/@jannis-eickenroth)

Team Lead Analytics Frameworks & Services
### [Kritika Murugan](https://www.wearedevelopers.com/@kritika-murugan)

Software Engineer at Finanz Informatik
### [Lars Reichert](https://www.wearedevelopers.com/@lars-reichert)

Head of Sales Management Solutions at Finanz Informatik


## Related talks at this congress

- [Migrating from COBOL with AI: A Moonshot Demo](https://www.wearedevelopers.com/events/world-congress-2025/sessions/495-migrating-from-cobol) — Julia Kordick
- [How to Destroy a Monolith?](https://www.wearedevelopers.com/events/world-congress-2025/sessions/549-how-to-destroy-a) — Babette Wagner
- [Navigating Application Modernization - Leveraging Gen-AI](https://www.wearedevelopers.com/events/world-congress-2025/sessions/781-navigating) — Shaaf Syed
- [From Friction to Flow: How We’re Empowering Developers ](https://www.wearedevelopers.com/events/world-congress-2025/sessions/705-from-friction-to) — Marek Wasilewski, Ronnie Stadie