(2) Upgrade SaaS, Cross-Platform Mobile & Desktop Apps (2)

I'm looking for a professional with extensive experience in upgrading SaaS, cross-platform mobile and desktop applications.

Key Requirements:
- Upgrade of existing SaaS solution
- Development of mobile app compatible with both iOS and Android
- Desktop application support for both Windows and macOS

Ideal Skills:
- Proficiency in cross-platform app development
- SaaS solution upgrade experience
- Mobile (iOS and Android) and Desktop (Windows and macOS) app development expertise.