SMS Tool APK Enhancement

I need an experienced Android developer to enhance an existing SMS sending APK.

Key requirements:
- Upload .csv with leads (name, phone, address)
- Compose personalized texts using variables (name, phone, address)
- Utilize local SIM card (eSIM)
- Manual input for custom sending delay in milliseconds

Additional improvements needed:
- Enhanced user interface
- Better performance
- More features

Ideal skills and experience:
- Proficiency in Android app development
- Experience with APK modification
- Strong UI/UX design skills
- Familiarity with eSIM technology

Please provide a portfolio with relevant projects.