Python to macOS App Conversion

I have a Python application that I need to be converted into a macOS-compatible app. The original python program has these features:
- User-friendly interface
- Offline functionality
- File encryption

I need all these features to be preserved and working perfectly in the new macOS app. The existing design and branding are not set in stone, so I'm open to suggestions on how to make it more user-friendly, modern, and visually appealing.

Ideal Freelancer:
- Proficient in Python and macOS app development
- Experience in preserving and enhancing existing software features
- Strong understanding of user interface design
- Familiarity with file encryption methods
- Ability to suggest and implement modern, minimalistic design elements.