12/2018–06/2020
Live Marketplace Frontend Migration
Chrono24
Frontend Engineer
Service 04
Legacy Modernization
Modernize existing systems incrementally – with a structured assessment, target architecture, migration plan and controlled releases, without interrupting operations.
What this means in practice
Modernizing a business-critical legacy system requires new technology, established business logic and ongoing operations to work together.
- 01
Frontend migration
Move server-rendered templates or older JavaScript structures incrementally to a component-based frontend with an appropriate rendering model.
- 02
Architecture modernization
Reshape modules, interfaces and responsibilities so changes become more focused and safer. The system context determines whether a modular monolith or selected services are the better fit.
- 03
Stack upgrades
Update runtimes, frameworks and dependencies without unnecessarily rewriting proven business logic. Clear technical boundaries reduce migration risk.
How I work
The assessment maps dependencies, operational risks and the cost of change. It then prioritizes the areas where modernization provides the greatest business or operational value.
The migration plan defines verifiable milestones. Each step is implemented, tested and validated in operation before the next one begins.
Not every older component is automatically a risk. Stable parts can intentionally remain in place when changing them would not provide sufficient value.
Typical scenarios
- jQuery, AngularJS or Backbone to React, Vue.js or Angular
- Monolith to services – where it makes sense
- Server-rendered templates to a component-based frontend
- Legacy desktop application to a web-based solution
- Protect critical areas incrementally with automated tests
Relevant projects
Projects with this focus.
2020Headless Commerce for BELViNi
BELViNi / Oetker Digital
Frontend Engineer
Other services
- 01Full-Stack DevelopmentWeb applications, customer portals and internal tools – from the business requirement to integration with your existing systems.
- 02Cloud & InfrastructureShip new versions safely and run your application reliably – with containers, CI/CD and suitable cloud services.
- 03Technical LeadershipInterim tech lead: taking technical responsibility, preparing and documenting decisions – while contributing to the code.
Contact
Let's talk about your project.
Send me a short note about the task, the technical context and your planned timeframe. I'll get back to you personally.
Patrick Schaub
Software Architect & Full-Stack Engineer
You talk to me directly.