Upgrade Existing Electron App

I need an experienced Electron app developer to upgrade my existing desktop application to the latest version of Electron.

Key Requirements:
- Upgrade an older Electron app to the latest version
- Ensure existing functionalities work seamlessly
- Modify any custom code interacting with Electron API
- Work with a few existing third-party libraries or modules

Ideal Skills and Experience:
- Strong experience with Electron and Node.js
- Familiarity with multiple third-party libraries
- Experience in maintaining and upgrading existing applications
- Proficient in modifying and understanding custom code

Please provide examples of previous work and your approach to handling legacy code.