Linphone Desktop App Rebranding

I need a skilled designer to rebrand the Linphone desktop app for MacOS and Windows.

Requirements:
- Update the application name with our logo and app icon (logo will be provided in PNG format)
- Update the color scheme as per our brand guidelines (to be provided)
- Revamp the UI design for a modern look

Ideal Skills and Experience:
- Extensive experience in Windows and MacOS application design
- Strong graphic design skills
- Ability to document modifications with screenshots or videos

Please provide a portfolio showcasing similar work.